Do not—I repeat–do not, spend a penny on that WalMart bike. Save your money and buy a real bike. I would take a look at a entry-level hardtail from any of the major brands. You should be able to get yourself something like a Specialized Rockhopper in a “Comp” build for a little over $500. If you start looking through FB Marketplace, you may even find a used one for less. Once this CV19 blows over, there are going to be a bunch of used bikes flooding the market. At least, that’s my prediction.