I'm not sure what you mean.
Do you want to buy xmr?
Go to poloniex.com
Do you want to know how to keep the coins in your own wallet?
https://www.monero.how/
https://getmonero.org/
To use the command line interface wallet (monero-wallet-cli), you have two options.
1) You can download ("sync") the blockchain and run a full node.
2) You can just run the wallet by itself, and connect to a remote node, which does not require having the blockchain on your computer.

Sorry for this question, but, how to do that?
Thanks in advance

ahh who cares.

Monero's got big transactions and will have big blocks. Its known.

If thats *the* reason that bitcoiners don't like the tech.... then things are looking good.

[–]theymos [score hidden] 7 hours ago*
Monero transactions are about 50x larger than their equivalent Bitcoin transactions. So to reach Bitcoin's current volume of transactions, Monero full nodes would need a continuous bandwidth of at least about (1MB * 50)/(10*60 seconds/block) = 83 kB/s. Probably much more than this would be required for an average node -- this is the theoretical minimum. It's not an impossible bandwidth even for many home users, but that much bandwidth is still a very high cost for full nodes. Monero transactions also require more computation to verify, but I don't know exactly how much compared to Bitcoin transactions; this might actually be more of a bottleneck than the bandwidth.
Additionally, Monero archival nodes dealing with Bitcoin-level tx volume would need to store about (1MB * 50 * 6 blocks/hour * 24 hours/day * 365 days/year) = 2.6TB per year. In Bitcoin, all but a few GB of this could be discarded due to pruning by non-archival nodes, but while Bitcoin full nodes can prune everything except UTXOs, Monero full nodes must store even spent TXOs forever. Monero can prune witness data and maybe some other stuff, but this only gets you a constant-factor reduction in storage. So storage-wise, Bitcoin scales more-or-less O(1), while Monero scales O(n), where n is the number of transactions.

"Monero transactions are about 50x larger than their equivalent Bitcoin transactions"

That is wrong twice.

First of all, let's start with objective facts. Current BTC typical transactions are about 500 bytes (looking at block explorer we see most 1 MB blocks have about 2000 tx). XMR RingCT transactions are about 13K, which makes them 26x larger, not 50x larger.

Second they are not "equivalent" since XMR transactions provide privacy and fungibility and BTC transactions don't. To get that with BTC you would have to run through mixers or multiple coinjoins or something, which would bloat the effective tx size by creating more transactions to do the same thing (or actually still less, since amounts aren't hidden, and fungibility is questionable since it is usually obvious when coins are run through a mixer)

How many GBs does XMR blockchain weight?

Did you try "ue" "ae" instead? Thing is you only need the first 3? characters of the words to build your mnemonic seed. Always told them that the Umlaute may cause some problems...

Why XMR was frozen at poloniex??