When you filed your tax return, the mailing address on the tax return would be the mailing address the IRS would mail your check to. If you did not include direct deposit information on your tax return, the IRS cannot direct deposit your stimulus payment unless you send them direct deposit information. You must wait until a portal opens online in mid April to be able to submit it to the IRS: https://www.irs.gov/coronavirus/economic-impact-payments
You will get your payment much faster if you provide direct deposit information to the IRS.
