Our thinking with hiding the description - once you've joined- is that it would otherwise always be at the top, taking up hugely important real estate. It's more of an ad to get people to join. How many times does someone really need to read the description of a group?
You raise a great point about not being able to edit the description - I can't find it either, so we'll need to add that. Seems you should be able to edit your description and the tags when you click the edit button, which is where you can currently edit the group name and tagline. We'll get that fixed asap.
re: editing and photo - you can (or at least should be) able to edit the group photo in the same way you can your profile photo - look for the little edit link under the image on the groups home page. If you're not see it, let me know and we'll fix.


