The dome frame has feet that can bolt into the platform - or into a concrete pad if needed. If setting up directly on the ground, you can also use ground screws or rebar to attach the feet.
Then, the outer cover ideally extends past the edge of the platform if it is a close fit (use our Platform Plans that fit our domes exactly!), and can be fastened with staples or trim to keep weather and critters out.
This type of trim works well and looks neat.