If you go to your wallet page on peakd.com which is the front end I use for HIVE (there are others, but I use peakd) then scroll down to this (see image below), and you will see an encrypted message. If you click the lock symbol that I drew an arrow to, then the message will decrypt so you can read it.
So go here: https://peakd.com/@yusmelys/wallet and find this transaction, and click the lock so you can read the message. Look for this:
Enter that password from the encoded message at pepegame.xyz in the password field and you should be in! :)