Hello,
You can either go online to make your estimated payments or you can mail them in.
Here is the website to pay the Federal estimates https://www.irs.gov/payments you will select the pay now option since this is a sole proprietor and goes on your individual return
Here is the website to pay Ca online and also the address to mail in the payment https://www.ftb.ca.gov/pay/estimated-tax-payments.html
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