I have created a really simple instruction sheet in Adobe PDF format, to help anyone get to grips with the UMB galleries.
Often the built in gallery is the first option people go for when new to boards etc.
You can get it from my own web site
HERE. (it's only 250k or so)
Hope it can be of assistance. I have included step by step screen grabs to show you where each link is situated on the relevant page.
If you get stuck with them, drop me private message and I can probably give you any further advice in one of the chatrooms.