Help with mail on Apple desktop [Edited]

I recently switched phone service from Verizon to Xfinity/Comcast with the assistance of Ms.Elizabeth [Edited: "Personal Information"].

My phone service is working and I was able to get my e-mail on my phone up and running. However, I don’t know how to get my email on my Apple desk top up and running. Help!! Thanks, [Edited: "Personal Information"]