you can embed your pictures within the post by hosting them on other sites like imageshack.us, photobucket, etc.
To use the forum solely you can only attach on picture per post. So, in effect, you'd make your post, add the attached picture, and if you want to do another picture you'd have to make another post and add the attachment to it.
For example, I'm adding an attachment to this post.
here's the URL to the attachment I added to this post:
https://www.britishcarforum.com/ubbthreads/memberfiles/239529-wheel.jpg
to embed that picture into this post i'd type:
<font class="small">Code:</font><hr /><pre>[image]https://www.britishcarforum.com/ubbthreads/memberfiles/239529-wheel.jpg[/image]</pre><hr />