Tubo tax said I needed to mail my federal amended return. I don't have an address. I filed Electronically initially.

The mailing address would be on the Filing Instructions page when you print out the amended tax return.

Go to this IRS website for the mailing address for a Form 1040-X, by state - See this TurboTax support FAQ for contacting support - https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/turbotax-phone-number/L0Od33nMQ_US_en_US?uid=lfgviwbm

https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment