Isn’t it just a matter of opening the front loop in the chain and looping in over the crankset as demonstrated in the video?
Also, don’t buy bike stuff at Walmart.
I tried that and had no luck. Maybe I can open the chain, get it off and go from there.
I went to Walmart. Trust me - I try to avoid buying stuff (especially bike-related items) at Walmart. But the nearest bike shop is ~20 miles away and I don't have room in my car to lug my bike there. I ended up buying a new chain and a bike repair kit at Walmart. They didn't have the chain tool so I had to buy a $20 bike repair tool kit that has the one tool I need.
It still baffles me how the only bike shop here (a college town, mind you) closed a couple years ago. But then again most people usually throw their bikes away and get a new one when something as simple as a flat tire happens.