So if your polo wallet is first then Polo wallet . (acct number) . 1 = what is or where can you get an account number. Is that they key you generate when you download the monero file from their site?
Most pools don't let you mine straight to exchange address, monero.crypto-pool.fr being one of them.
Dwarfpool mining to polo:
-u deposit address(from polo).payment id(from polo) -p x
Minimum payout is 5 xmr, with 6x480 it takes about week to get there. I would just use mymonero to create new address and use that for mining, works in every pool and you get faster payouts.