It depends. I would print the form and mail it according to the instructions in this Turbo Tax link. Here is a link to the form itself where you can fill out and send in to the State of California. Send it with a letter stating you forgot to send in with your 2020 California State return and you are sending it now.
Once completed, send this form and make the payment to Franchise Tax Board, PO box 942857, Sacramento CA 94257-0501.
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