Sus, to get back to the main page (I think you're meaning the main listing of all the forums) just go to the top and you'll see where it says Pet Talk > Other > General ... just click on the word Pet Talk, and that will take you to the main menu page.

You can still remain invisible. You see yourself with an asterisk next to your name but nobody else can see you. If you were invisible before, you still are.

It really is a great improvement! Much easier and "cleaner"