@candidough47 - the risers go under the legs/casters of the bedframe at the head of the bed. I have had to eliminate the headboard on my bed because the risers make a headboard a bad fit. At least, in my experience I haven’t found a headboard yet that would work with the risers under the top of the bed (frame).

Bed risers are found in any bedding store - and definitely on Amazon.

Risers are probably more economical, but you can also buy a wedge. I bought a full body wedge from Amazon. It's basically a graduated piece of foam that goes under the mattress and elevates the upper part of the mattress.