Help setting up

I use GoDaddy and installed phpList through Cpanel.
I don’t really know how to set up the config properly.
Does anyone have easy to follow step-by-step instructions on setting it up?

The error I am currently getting is the “cannot connect to smtp” error.

I host my own custom domain email on Protonmail. Do I enter their server details somewhere?
I’m actually lost at how to set this thing up