Can't access "Extra Tax on Early Retirement Withdrawals" page

I accidentally over-contributed to my Roth IRA in 2019. I removed the excess in 2020. I was told by someone at Vanguard that I should pay the penalty with my 2019 return, even though I won't receive a 1099-R until next year. I assumed I'd need to enter this info on the "Extra Tax on Early Retirement Withdrawals" but it won't let me visit this page... it just refreshes the current page I'm on. Any thoughts on this?