How do I amend a Family Court Motion in California?

I recently filed a motion in Family Court, Santa Clara County California. I didn't check relief box or add relief. The motion was served to the other parties Attorney. The matter isnt for another 3 weeks. I would like to amend this motion, and check relief and add relief. How can this be done?? Please help! I am not represented. I am in Pro Per.How do I amend a Family Court Motion in California?best to call the Clerk of Court office. (408) 882-2100, select option 6, then 7