Here's what you need to do in TurboTax Free for tax year 2017:
There is no checkbox to check for the releve 1. Did all your steps and I cant see it on 2019 version. Am I blind?
To enter your Releve 1 when you do not reside in Quebec, in the Free version of TurboTax Online, from the sidebar, go to;
Continue to the T4 Summary page and choose to "Add T4". Enter your T4 choosing QC as your Province of Employment. Box E of the Releve 1 is entered near the bottom of this screen.
The equivalent to an RL-1 is a T4a. Ran into this problem today.