There's two ways you can add things to the folders you create. The first is through the work itself - all you have to do is go to the "set options for your work" after updating/submitting a work. Once you're there, you should see a question asking which folder the work should go into.
Alternatively, you can do it through the settings option - that's the little gear icon at the top of the page. You'll want to click on "profile" at the top and then "edit portfolio" on the left side of the page. Go to the unsorted folder and find the work you want to move. Each work in that folder has a little info box - its title, genre, and what exactly it is. At the very bottom of the box, you'll see a drop down menu that currently says "unsorted". Click on that, and you should be able to move it to a new folder! Just don't forget to hit "Submit" at the very bottom of the page.
