How do I change the number of rings my phone receives before my voice mail answers?

Ah, we got just the article for you right here: Change Number of Rings Before a Call Is Sent to Voice Mail

If you're in one of the areas listed in the article, call us.
If you're in 92103 like your name implies (or any Cox area NOT listed in that article), it's *78, wait for the stutter-dialtone to go back to regular dialtone, pick a number between 2 and 9 for the number of rings, wait for the fast-busy tone to confirm, hang up.
Easy as that.