When reupholstering a chair, you'll first need to disassemble the cushion or the upholstered parts. Some chairs have seats that can be screwed right off, and some are attached. If the padding is in good condition, you can cover the seat easily with new fabric using either upholster glue or staples. If you cannot dislodge the upholstered area of a chair, you have to neatly tuck the fabric around the edges and add something that will conceal the seams. Either roping or fabric beading will work.