As requested, here's a little step by step:
First come into the forum and go to the section you would like to post in. Then click "New Topic":

Then title your new topic and choose a message emoticon if you choose:

Then write whatever you'd like in the subject area, click spell check, then click either preview or post:

If you have photobucket (which is what I recommend, it's a free picture uploading website -
www.photobucket.com), this is what code you'll need to post pictures in your threads:

You can also copy/paste the IMG code from your album if you "hover" over the picture, there will be a drop down of choices and just choose the IMG code like before:

If you have any further questions, please do not hesitate to ask!!