When you first launch the application on the Droid, hit you menu button on the phone ( the 3 lines at the bottom ). That should bring up a choice of options including "login" ( or logout if you are logged in ).
I'm sure you not dumb...you're probably still stinging from the Bear's loss on Sunday
On my Samsung moment, once you are in a thread, you hit the "menu" button, and a little sub screen pops and there's a button that says, "reply to this thread."
yeah having a droid you should know to always press your menu button for anything. I do it with every app I install just to see what other options are to be had.