UPDATED FOR TAX YEAR 2019
You need to print out your amended return and mail it to the IRS. The IRS does not support e-filing of amended returns. Mail the return to the Internal Revenue Service Center for the place where you live -- the address should appear on the filing instructions when you print out your amended return.
Form 1040-X filing addresses can also be found in the instructions for Form 1040X (page 20 - Where to File).
You will also need to include a check for any payments. [If you are getting a refund, the IRS will mail you a check.]
[Edited | 4/13/2020 | 7:33 am PDT]
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