How do I use the new special lookback rule on my taxes?

I haven't been able to work in 2020 because of covid-19, how can I use the new special lookback rule and use 2019 earned income this year for taxes? I had a child this year also so I dont want to miss out on having her credit too. So how do I do it, turbo tax hasn'tgiven me the option. Did I miss it in a section or does it ask you before you file (haven't reached that part yet)? Please help!