How do I locate the shuttle bus from LAX to their rental office

Look for purple signs that says rental cars pickup and the company's name are listed as well like hertz, avis and dollar

Follow the bouncing ball

They pick up people every 15 minutos, outside the airport, in the purple stops

You Will find it outside the airport. The shuttle bus comes around every 10-15 mins.

Outside look for the rental car shuttle sign it across the street. I think the sofn is purple