As someone who (unfortunately) has had several run-ins with the wonderful safety officers of the glorious California Highway Patrol, I may be of assistance.
On the ticket, usually at the bottom, there will be a time and date to appear in court, as well as an address. In addition to this, the court will mail you a letter explaining that you must show up in court at the location and address mentioned on the citation itself (as a reminder).....or..... pay x dollar amount and mail to the court before the appearance date. If for whatever reason, you lost the citation and the letter, contact the CHP office in the area the citation was made, and they can usually look it up based on your plate number.
do NOT, DO NOT forget to pay and/or skip out on your court date, they will fuck you. Fines around $1000 and revocation of your driver's license are real penalties. Oh, and most counties handle this through collections agencies, so that stays on your credit for ~6 years.
Also, you're a dumbass for trying to get away with that. There are signs like every 1/4 mile reminding you that it's a carpool lane and even like every half mile it reminds you the minimum fine is like $341 or something.
