I had to make a page with stickers and stuff so I can just copy/paste them on profiles. The Civil War Sticker is nice because it also adds the category.
As far as categories, they are easy to add if they already exist. When you are in edit mode, just above the text box is a series of items. Right in front of the C Cite your sources! is a box with little rectangles. That is for adding categories. Just click it and type in your category. If it exists, it will be listed. You may have to play around with it to get the correct format.