How do I fix my glasses?

If you got them fairly recently, first check and see if they are still under warrantee, a lot of places guarantee them for a year, it is worth asking, the worst that can happen is they say no.

It is difficult or impossible to make a decent repair on broken metal frames, the attempts I've seen with epoxy, J-B Weld, super glue, etc are generally a complete mess (often fingerprints in glue all over the lenses etc) and don't hold up long. Theorectically, you could remove the lenses and maybe get a jeweler or other craftsperson to hard-solder them, but doing this will burn off the finish where the repair is made, and, depending on the metal alloy used for the frames, it isn't always possible.

There is one repair you might be able to do yourself. If the only part that broke was the one of the things that go over your ears (the front part of the frames is totally OK) you might be able to take the ear things off another pair of old glasses of similar color and design (or buy some cheap reading glasses and take the ear things off) and substitute them. You might have to file the ends slightly to fit the front part properly. Because the new ear things might have a different finish and/or design you would need to replace both, even then, it might look wierd or it could look totally OK. I have done this for friends several times.

DON'T use glue , there is no glue that will fix broken metal. You will just ruin the lenses too.

Go to an optical store with them, you probably need a new frame.

Broken frames can rarely be fixed.

Since it's metal I would use Loc-tite adhesive, though super-glue might work.