If you go to "browse gallery" on your page, next to browse, you should see a blue 'edit' button, click it.
Then on the side bar... which is the darker shaded area to the left, you should see a blue "+" sign, and new folder under it, click it, and name it if you plan to.
Once you're done that, and you've created your folder, you should be able to drag and drop your compositions.
You can tweak it to however you like with the 'options' tab.
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.