How I comping on Cubase 9?

Hey. I’m Thor Oach. I’m new here.
I have a problem with Cubase 9: I don’t know how to comp vocals.
I have three takes of vocal audio and I want to edit them, but I don’t know how.
I don’t know how to do this. I’ve tried anything. It’s definitely impossible to comp.

Howdy Thor!

https://www.youtube.com/watch?v=bPVm3lVVTpA

https://www.youtube.com/watch?v=kzX7qn3DSl0 (Starting at 13:15)