For many of us, using a forum may be a new experiance. There is a good FAQ tab (located above, on the second grey bar) that will help with How To questions, but here is a brief example of uploading a picture or JPEG file.
Decide where you want your post to apear, and select "new Topic", or just add your post to an existing topic.
Fill in the subject line, then click down into the text window and type or paste in your message.
To attach a picture or JPEG file, click on the tab below the text window that says "upload attachment". A new window will open, click on the "browse" tab, and look for your picture, select your picture from your directory, and then click on the "Add the file"tab, this will show up in a new line under the big text window, you can repeat the process to add more pics. At this time, I do not know what the limit is. Best not get greedy, just do a few then select the "submit"button.
When several attachments are Submitted, the last one will appear first on the Post, the sequence will be from last to first.
Good Luck, thanks for your contrbution!