To Post a photo on the Big Walls Forum:You can easily post photos on this fourm and they will also be part of the forum gallery1. First, make sure you are signed into the forum, then go to
http://www.bigwalls.com/forum2/gallery/index.php 2. Click upload content.
3. Copy and paste the link for the photo. To find the link for the photo, view your photo in full size in the gallery. You can either right click and copy the URL, or at the bottom left there should be a link called "Save-right click and link target". Click that, then copy and paste the http addess of the page (the url at the top of your browser).
4. Finally, return to the forum, and paste the link into your forum post. Then, select the link and click the image icon above. The link will then be properly surrounded by [ img] and [ /img] tags (no spaces). The photos will also be part of the gallery.
Tip: Make sure you are signed in before you link to the gallery.
The first gallery photo has been posted by Freakshow:

Older Instructions (still applicable)
1. Images must be hosted elsewhere.
--Try
http://xs.to which allows photo hosting with just a few clicks (no sign-up necessary).
2. Copy the image URL (the http:// address), and return to the Big Walls Forum.
3. Click the "Insert Image" icon above the forum text entry box.
4. Paste the URL of the image location inbetwen the [img ]http://and [/img ] tags.
(note: the tags can be typed manually too, just make sure there are no spaces within each tag, or between the tags and the URL.)
It looks something like this
[ img]http://yourHost.com/YOURPHOTO.jpg[/img]
-- the image will show in your new post!