Should be the same credentials as you use for here using either steemconnect or keychain. If you take it to the Steem-engine, You can sell for SSTEEM and by cards. You might be able to do the same with TRON, but I have never done that.
I run another account called @senstlessmonster, where I start with the starter deck with no additional investment. Only what I make via selling the reward cards and DEC. Check it out, its been running since Janurary, and is doing well, the DEC has really helped me get more $$ for cards.