Where do I input contributions to my personal roth/traditional IRA accounts that I made in 2020 for 2019 AFTER completing my 2019 tax return on my 2020 return?

- I opened both traditional and roth IRAs in 2020 after filing my 2019 taxes.
- I made contributions to the accounts for 2019.
- Where do I include this in 2020s tax return?