How does one use Quakespasm for Mac?

Hai

So I read here that if I wanted to play Quake 1 on Mac I should use QuakeSpasm. I downloaded it but I have no clue how to use it. I haven't purchased Quake 1, planning on doing so if it's needed, but I would have no idea how to make it run on QuakeSpasm.

Or should I use EZQuake?

Help pls