Flip the seat base over and pull the upholstery inside out as shown (it will sit on top of the seat foam, sort of like a crown). The remaining rings secure the upholstery to the frame through the trenches found in the foam. A helper can spread the foam open for you to see the retaining rings and remove them. Once the upholstery is free, set the frame and seat foam aside, make repairs to the frame, or replace the foam as needed. Ours was in very good condition.