How do I get CPA help via TurboTax?

I would like to file back taxes from 206 to 2018 plus 2019 over the next few weeks. Prior taxes were done by a CPA. I am now looking to do the taxes myself (I am new to TurboTax) with as needed help from a CPA through Turbotax. I seem to recall seeing an option to get CPA help (fee for service) but I cannot find it anymore. Can somebody show me where it is located? Thank you!