To save items - you can "favourite" items from sets here and when you create those items will be in your favourites on the left side of the page where you find other items. To add items from your computer you go to the top of the page to where your name is on the right, beside it is a small arrow that gives you a drop down menu. On that menu you will see an option to add or edit an album. I use that option and add my images there. Then to find those on the create page you look under your...
