I remember how frustrating it was to try and figure this out when I started! There is a photo sharing available right on this site. If you go to "bearded dragon discussions" link on this site it will list a few topics incl new photo sharing info. I'm not familiar with how it works but I know the photobucket route. Info listed here:
Upload photos to a site like photobucket.com
Then click on your photo on the photobucket site and look for a chain link image. (See photo below) It's in a circle near the F (Facebook) bird image (twitter) and envelope image. Click on that chain link circle then it will show you four links Click on and copy the link in the last one called IMG (for forums, boards) (see photo below) and then paste that link in your message. If you click preview it will show you your post incl the image.
As a side note, don't use emoticons from your device (iphone etc) as it will pose a problem for posting.
Also don't add other tags to the link.
Good luck!
Gabrielle
Photos of info from iphone view of photobucket.