Hi to you both.

When you log in, if you click on 'View new posts' near the top right of the screen, it will give you all the posts made since your last visit.
At the moment, people are mostly posting in the Celeb BB forum. There is usually a thread entitled Day 19 (or whatever day it is) Highlight Show and that starts by giving a summary of the show and then people can post under that their comments on that show.
If you want to say anything about BB, then you can start a new thread in the BB forum.
The General Chat is for any chat not related to any of the other sections.
You can also just have a look around to see what other sections there are, in case there is anything else you would like to post in, like the games or other reality TV or soaps etc.
If you have any more questions, just ask.