TxIn means that it's in the record of transactions we have received. That does not mean your registration has been completed. You will receive a welcome transaction in your wallet once your registration is completed if you are not previously a member.
You do not have to use any specific tag, and we prefer that members only use the #steembasicincome tag for contests with SBI prizes or for posts about @steembasicincome or Universal Basic Income.
You can publish in Spanish or English - whichever is more comfortable for you.