How do i ground the 13 pin on the diagnostic plug. I keep hearing to do that but idk how?

What year is your blazer?

its a 2000 sonoma.

its a 2000 sonoma.

Always stay with the post you started.
If you do not know how to ground a circuit tell us what you are having problems with.

Is it how to ground it or just finding pin 13?

To ground a circuit you have to connect it to a ground with a electrical wire or a conducter.