It has changed a bit. The Search button is a little magnifying glass icon just to the right of the “DONATIONS” button/tab along the top of the window. You posted (a “topic”) in the General Discussion forum, and it seems to generally post in whatever forum you’re currently looking at. I haven’t had to login in a long time, so I’m not sure where that’s hiding.

The login (or your profile if you're already logged in) is in the upper right corner. That's where you also can "sign out". As long as you don't log out or delete your cookies there doesn't seem to be a limit for login time.

When I first arrived here, it was confusing as heck!!!!! I got the hang of things by learning and staying on here and finding my way. My advice is that everything new takes time, I am sure you will get everything with time. That is how I did it lol.