To add a photo go to your privete messages and look at the options table to your left and you will see many diff things you can do....just scan down through the table until you find what you what to edit
To setup a web store for your bettas youll need a website, I chose webs for 2 reasons
1) its free :P
2) they offer so much for free
So your site can be a betta site (like mine) or a store only, or a mix, on webs your limited to 5 items for selling.
Pick some strain names, like mine Red Crusaders and Blue Ocean (it's prohibited to use other breeders strain names, so make up your own), a strain name is a short name for the genetics. Red crusaders are, red copper, dragon, geno gold, half-sun. But Red Crusaders is an easier way to say red copper, dragon, geno old, halfsun, bred by Dom.
Add photos, don't show photos of EVERY fish, just the best looking ones. Bettas are liek internet dating (not that I've tried that) so you see a picture of a girl, then you meet her, and she looks NOTHING like the picture, lol. You may see a betta that you like and end up with one totally different. So provide a description and a basic photo of the strain.