You are in the right area Lynn.
Take the Frontage Rd. back towards the I-10 exit. Go straight through the roundabout and continue on that road for 2.7 miles. It will turn to dirt at .7 miles. Bob has a YouTube video with detailed instructions, but my directions will get you in Bob people country.
I'd come and guide you back, but I'm at the hot springs in Holtville, CA at the moment. Good luck. If you see a big white school bus on your right side as you come in, I know that is a member of the tribe. The bus has "Hannah" written on it. I havn't met that person yet, but they did welcome me to the area, and they would be a fairly easy person to find and get some directions and advice from.