How can I claim a Recovery Rebate Credit for my missing first stimulus check?

I was eligible for the first stimulus check but never got it. I used the "Get My Payment" IRS tool, but it never worked. I read on the IRS website that I can get the Recovery Rebate Credit with my 2020 taxes by using Form 1040 or 1040-SR, but I can't find where this is on my turbotax online portal or just how to claim this credit using turbotax. Please help 🙂