If you have California taxes due, the Form FTB 3582 Payment Voucher should have been included in your tax return. You can print the form here https://www.ftb.ca.gov/forms/2017/17_3582.pdf and mail along with your check.
Using black or blue ink, make your check or money order payable to “Franchise Tax Board.” Do not send cash.
Write your SSN or ITIN and “2017 FTB 3582” on the check or money order. Make all checks or money orders payable in U.S. dollars and drawn against a U.S. financial institution.
Detach the payment voucher from the bottom of this page, only if an amount is due. Enclose, but do not staple, your payment with the voucher and
FRANCHISE TAX BOARD
PO BOX 942867
SACRAMENTO CA 94267-000
Note: Mail form FTB 3582 to the Federal Tax Board with your payment for the full amount by April 17, 2018. As an alternative, you can make your payment online at https://www.ftb.ca.gov/online/payment_choices.shtml?WT.mc_id=payR.