Question about file sets

Thanks for the File Browser from me to all of the staff of 343i who helped make this happen! I love the new file browser, it is very useful to me. However, I have a question. I can view all of the file sets I started for halo reach that I created on bungie.net, but I can’t figure out how to make more and how to add photos to a fileset. How do I do this? Your help is appreciated!