This is a public website that can be seen by everyone. Please do not try to post your personal information like your email address here. The filter removed it for your protection from scammers and would-be identity thieves.
What do you mean by "pay back?" Do you mean you owe tax due and need to pay the IRS? If so you can do that yourself by using the IRS website:
https://www.irs.gov/payments
https://ttlc.intuit.com/community/tax-payments/help/how-can-i-pay-my-federal-taxes/00/26212
But your post is unclear. Did you file your 2021 tax return at all? Or is it still un-filed? If you did not e-file it and did not mail it, the ONLY way to file it now is by mail. E-filing is permanently closed for 2021 returns, so the only way to file 2021 is to print, sign and mail the tax return. Post back and clarify your situation so that we can be more helpful.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**