I bought a Hyper Cruiser bike last night from Walmart and as I'm pedaling home the rear wheel stops moving while pedaling.
I don't know how to fix this, please help. This is what the bike look like.
You just bought a new bike from a retail shop and it breaks down that day on the way home. This feels like an early indication that the bicycle is rubbish and this is the start of a long list of problems that will put you off riding.
I'd absolutely suggest you return it to the shop for a full refund, immediately.
Then look for a better bike - don't discount a used bike as an option.