Either:
open the console and enter:

Or add the lines:
to the datacoin.conf file - see example datacoin.conf here:

https://github.com/datacoinproject/datacoin/releases/download/0.16.3.1/example.datacoin.conf

Cheers

Graham

In the config I have these lines for entering

addnode 213.31.19.87 add
addnode 89.73.143.76 add
addnode 144.76.118.44 add

16:04:19

getpeerinfo


16:04:19

[
  {
    "id": 2,
    "addr": "144.76.118.44",
    "addrlocal": "185.96.30.239:53034",
    "addrbind": "192.168.0.102:53034",
    "services": "000000000000040d",
    "relaytxes": true,
    "lastsend": 1623762254,
    "lastrecv": 1623762254,
    "bytessent": 2358,
    "bytesrecv": 12797,
    "conntime": 1623762014,
    "timeoffset": 33,
    "pingtime": 0.042556,
    "minping": 0.041925,
    "version": 70015,
    "subver": "/Datoshi:0.16.3/",
    "inbound": false,
    "addnode": true,
    "startingheight": 4014581,
    "banscore": 0,
    "synced_headers": 4014602,
    "synced_blocks": 4014602,
    "inflight": [
    ],
    "whitelisted": false,
    "bytessent_per_msg": {
      "addr": 55,
      "feefilter": 32,
      "getaddr": 24,
      "getdata": 640,
      "getheaders": 1117,
      "headers": 25,
      "ping": 96,
      "pong": 96,
      "sendcmpct": 99,
      "sendheaders": 24,
      "verack": 24,
      "version": 126
    },
    "bytesrecv_per_msg": {
      "addr": 1760,
      "block": 2918,
      "cmpctblock": 4699,
      "feefilter": 32,
      "getheaders": 1117,
      "headers": 1519,
      "inv": 61,
      "ping": 96,
      "pong": 96,
      "sendcmpct": 66,
      "sendheaders": 24,
      "tx": 259,
      "verack": 24,
      "version": 126
    }
  },
  {
    "id": 3,
    "addr": "91.250.62.26:4777",
    "addrlocal": "185.96.30.239:53037",
    "addrbind": "192.168.0.102:53037",
    "services": "0000000000000001",
    "relaytxes": true,
    "lastsend": 1623762249,
    "lastrecv": 1623762174,
    "bytessent": 764678,
    "bytesrecv": 120361807,
    "conntime": 1623762018,
    "timeoffset": 32,
    "pingtime": 0.171037,
    "minping": 0.171037,
    "version": 70001,
    "subver": "/Satoshi:0.8.3/",
    "inbound": false,
    "addnode": false,
    "startingheight": 1464487,
    "banscore": 0,
    "synced_headers": 1466368,
    "synced_blocks": -1,
    "inflight": [
    ],
    "whitelisted": false,
    "bytessent_per_msg": {
      "addr": 55,
      "getaddr": 24,
      "getheaders": 762982,
      "inv": 1403,
      "ping": 64,
      "verack": 24,
      "version": 126
    },
    "bytesrecv_per_msg": {
      "addr": 32152,
      "headers": 120322182,
      "inv": 7261,
      "pong": 64,
      "verack": 24,
      "version": 124
    }
  }
]

Coins are still not sent
Cтaтyc: 0/unconfirmed, not in memory pool
Дaтa: 15.06.2021 08:47
To: freiexchange DDFuWNPHqf9H475n7BTfS4oy8hhgCHWfSF
Debit: -998.67500000 DTC
Transaction fee: -1.32500000 DTC
Net amount: -1000.00000000 DTC
Transaction ID: 93cf832df09094c97fea66ec5b7c26ab4fd66e88904b173a6ca4862960354296
Transaction total size: 1325 bytes
Output index: 0

And how to refuse to transfer later?

Meh, wrong. Just tried to synch from 213.31.19.87 and 89.73.143.76,  can't connect to either from here.

Currently, the only listening nodes are:
It's worth ensuring you have both as addnodes, if not connects.

Cheers

Graham

Latest list of recently-seen nodes, edited from bytestamp's peers list

addnode=102.165.224.64
addnode=103.246.152.226
addnode=103.246.152.233
addnode=112.198.79.59
addnode=112.95.235.238
addnode=113.10.158.207
addnode=113.10.242.157
addnode=114.79.37.60
addnode=117.34.72.3
addnode=122.192.218.102
addnode=144.76.118.44
addnode=144.76.64.49
addnode=146.199.233.66
addnode=150.143.250.57
addnode=175.139.175.82
addnode=192.186.4.213
addnode=202.114.29.51
addnode=204.48.92.37
addnode=204.48.92.48
addnode=213.31.19.33
addnode=213.31.19.87
addnode=213.31.19.98
addnode=218.57.139.132
addnode=221.194.44.178
addnode=221.194.44.198
addnode=221.194.44.205
addnode=27.145.61.18
addnode=45.63.115.238
addnode=50.17.6.175
addnode=51.148.146.204
addnode=54.193.18.89
addnode=54.193.64.123
addnode=54.206.54.159
addnode=58.218.199.216
addnode=58.218.199.248
addnode=89.73.143.76
addnode=91.250.62.26
addnode=95.217.78.168
addnode=graymines.net



Edit:
Meh, I fed them into my client, which can only connect to:

addnode=144.76.64.49
addnode=51.148.146.204
addnode=91.250.62.26

So yeah, there were only two listening nodes, now three - and two of them are my nodes, one remote, one local (configured with `upnp=1` so my router's UPNP allows external access to the standard 4777 port - but a static IP address is needed, won't work with network running behind a dynamic IP address).


Cheers

Graham

ive created a new listening node of v16.3 hope it solves my problem
addnode=198.199.70.169

Turns out that the wallet is hard-coded by default to use segwit addresses and on a non-upgraded network, coins sent to segwit addresses are lost.

Don't use the 0.16.3 client, revert to either the 0.8.6 client or the Crossverse 0.15.99 client.

I've withdrawn the 0.16.3 release and deleted the repository as it's clear that supporting this particular upgrade is beyond my skillset.

If you have coins stuck on segwit addresses, PM me with the relevant 0.16.3 client privkey and I'll replace your coins.

Sad but true.

Cheers

Graham

I cannot pick up my  dtc ?
How to transfer coins from one wallet to another?