This seems like a dumb question but oh well. I was wondering how you put items inside sets. Thanks.

Click the back next to the item, then scroll to the top where is has the pull down bar for selected items and change it to "add item to set _____" and then just click submit.

Go into your inventory and click this

And a little tab should open which says add to set or what ever you named the set
e.g add to <name of set>

Hmm, Ok thanks guys. Closing.