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After the transfer arrives, go to your Wallet Page and click the Steem dropdown and then click Power Up.
You can verify it worked on your user page here https://steemd.com/@andrius
Powered Up steem is listed as Vests.

Send it to your username , in your case "andrius"

I'd advise testing with a small amount to make sure everything works ok.

really ? if i want withdraw from bittrex and send here i need as address use my username ? in this case 'andrius'

Yes, put andrius in the 'Registered Acct' field when you withdraw from Bittrex.

You put notes to yourself in the memo field.