The belt is broken on my audio technica turntable

You should be able to find a replacement belt online, you should also be able to find a manual. Here's a link to a similar (possibly your) model https://manuals.plus/m/310a8717721e78df0...

As you can see the replacement procedure is simple. If you cannot afford or just want to fix the belt itself, a careful drop of cyanoacrylate adhesive (super glue) may give you a temporary fix, for a longer term repair a flexible adhesive reinforced with glas fibers from a bit of fiberglass strapping tape to the outside (non-contact) surface should hold indefinitely.