This might sound silly but I bought a stainless steamer to steam veggies and I don't know how to use it?

Looks to me like this steamer goes on the stove. You fill the bottom with water (about 1/3, I'd say) plus any seasonings you want. Or you can add broth to the bottom. The vegetables or whatever go in the top two layers. Put the lid on top, set it on the stove and let the water boil.