Hi Forest B,
Am I right by understanding that you don't want to use the email address you have, but you want another one ending in Videotron. CA?
In that case, just connect yourself in your customer center and choose "Internet".
Then look at the E-Mail section and choose "MANAGE YOUR VIDEOTRON E-MAIL ACCOUNT".
You can, there, create a secondary email address, in fact up to 6 ones.
I hope it helped you.
Have a nice day