The Polyvore editor lets you compose your sets using items that have been imported into Polyvore by you or other users. Think of it as a very simple collage editor.
The Polyvore editor has two main areas: the canvas and item panels. Simply drag items from the items panel over to the canvas. Once there, you can drag the items around, resize them by dragging on the small squares at each corner, etc...
The items panel contains different tabs:
You can save your set as a draft and come back to continue working on it at a later time. Once you are happy with your creation, you can publish it with a title, notes and also add it to any groups you belong to.
Note: You can make changes to your sets at any time but you will have to re-publish them if you want others to see those changes.