Amend 2020 Tax Forms for the Recovery Rebate Credit

How can I amend my 2020 Tax Froms to apply or complete the 1040-X form? We recently mailed in the 2019 Tax Froms to the IRS for my daughter. After realizing we forgot to claim her as a dependant in 2019 on our Tax Froms. This may now work in our favor as she should now be qualified for the 3 Stimulus checks.

 

We recently completed my daughters 2020 taxes via E-File using Turbo Tax Online version. Shortly after while doing our taxes noticed we didn't claim her as a dependant in 2019.

 

How can we amend my daughters 2020 taxes to trigger the 1040-X form for the Recovery Rebate Credit?