Full size futon *mattress only (Sneads Ferry)

I got this futon set about a week ago. I didn't realize the futon mattress is a spring mattress and not foam. I'm a disabled vet. I'm due for back surgery and the springs are too hard on my back. I'm keeping the frame. I have a new foam mattress coming on Friday. The mattress cover is a nice light blue linen fabric. It's a full size mattress for a futon frame. I can't lift anything and won't be able to help move it.