What is 8606-T Explanation Stmt

Hi there. Need some help..

 

I did a backdoor Roth IRA in 2021 and also made conversion of Trad IRA to Roth IRA. I got 1099-R for both and uploaded to TT desktop version. Its asking for "8606-T Explanation Stmt" - Return of an IRA Contribution Before the Due Date of the Tax Return. What should I enter? Any suggest would be appreciated. Thanks