You can Print your return and check the page of Filing Instructions that prints with your return. This willl tell you what you need to mail, and where to mail it.
Click this link for info about How to Print Filing Instructions
The IRS will send a letter confirming your Installment Payments, along with instructions for sending your first payment (in about 30 days).
[Edited 3/10/2020 | 4:06 PM]
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