Backdoor ROTH IRA Conversion without 1099-R form

For 2019 backdoor ROTH IRA conversion, I was little late and that transaction happened on Jan 3rd 2020. So, I don’t have 10990-R form.

How can I add backdoor ROTH IRA conversion?

 

I tried follow different steps from this forum, but it’s bit confusing when it’s asking me to add 1099-R form. Appreciate your help.