First of all, you need to open the web browser page on your Mac.
This selection will be for the authentication with a browser that you choose for your preference.
Now a window will appear where you will choose your Google account & there. You have to enter your TELUS email address & then select the option next.
Now you will have to enter the password &, once again, select the next button.
Now you will have to close internet accounts windows.
At last, your TELUS email account will get set up in the mail application.