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That's called a springbar. You'll need to figure out what size it is, which you can do by measuring the distance between the lugs (usually in mm). Typically (though not always), they're in multiples of 2, e.g. 18, 20, 22, etc.. Once you know that, you can order them on amazon, among other places. You can use a jeweler's screwdriver or other small tool to install it, but you might have better luck if you get a springbar tool as well. If you're worried about scratching the finish, you can put some scotch tape on the lugs. It's not difficult, but it does take a steady hand, and it's not uncommon to accidentally shoot a springbar across the room when trying to install it (you might want to make sure you get a couple, in case that does happen).

Alternatively, most any jewlery shop that sells watches or watch kiosk in a mall can replace it for you. Honestly, that's about all that I would trust a mall kiosk to do to a watch.

Good luck!

Is it plastic or glass? If it is plastic, you can either buy this tool OR remove the crown, and movement, and push the crystal out. (This would also work for glass) and using calipers measure out the width of the crystal. Then you can either use esslinger or this to buy the crystal. You can use the same tool to compress the crystal and put it in your watch. This is a horrible explanation, and I'm sorry if it's too /r/restofthefuckingowl but it's really hard to describe. Here's a pretty good video of how to do it for glass and here's one for plastic hope this helps.

Something like this?

https://www.amazon.com/Rain-X-800001809-Headlight-Restoration-Kit/dp/B003VZLJFG/

I have a turntable dust cover I could do this on as well so I figure two birds with one stone!

Something like this?

I'm about to purchase this one, I'll let you know how it goes!

https://www.amazon.com/gp/product/B07H8D23L6/ref=ox_sc_act_title_2?smid=A2CGN80EVS3S24&psc=1