Hi, its sounds like you're not getting a proper seal to create a vacuum if nothing is happening.
Using some lube around the black seal helps, also the kit should have come with a couple of black seals, it's worth starting with the smaller one. Pubes can also cause issues with a seal so possibly worth shaving a bit...........carefully! 😬🤣 where the seal meets your body
Then take it slow, few pumps, pause, pump again. I didn't get on with the rings supplied, they felt insanely tight so bought some alternatives from love honey
All the best