Hi- I also wanna be thin and there's great support here to help us, it look like!
It is a big board, lol! Just look for what interests you. I'm doing Weight Watchers so that's where I've been reading and lurking about.
Maybe the plan you're doing is there in the "Diet Central" area.
If you just need support, check out the "Support Forum" and see what clicks with you- and jump on in and say hi.
Just lurk around and read until you're comfortable. I bet you'll soon find a thread where you won't be able to help yourself from jumping in. Good luck and see you around!
Introduction
Don't worry, you will figure everything out in no time. This is a great place -- with lots of great people, info, and wonderful support. We have a 50+ forum here you may want to join. Just look around and jump in wherever you feel comfortable ... 
