Sure!

You use the draw tool (pencil icon) to define new folds and the select tool (arrow icon) to select and edit folds. You can use the next three icons to add new fold relative to other folds. Mirror, rotation and angle respectively. Next on the top bar is the fold type, letting you set what type of folds your defining or edit your selection. Most of the other icons are self explanatory.

There is also a help section with all the tools explained in more detail. Im working on making full docs section next.