Go here
www.skybroadband.com and login:
Once logged in click on
MY PROFILE in the top menu, the
MY PROFILE again just below it.
Login again (note you can skip the above two if you log in below first
www.sky.com/portal/site/skycom/mysky
Now click on
EDIT MY SKY PROFILE
You now have three options
VIEW MY PERSONAL DETAILS - Change your details etc
VIEW MY LOGIN DETAILS - Change your password etc
Click on
VIEW MY ADDITIONAL USERS
Any users created will appear under active users.
Click on
SET UP AN ADDITIONAL USER
Input your details, the email address is used to send you a welcome message
The username will be your new sky email address and will be used to login.
Success
You can now login with the new account and check your emails (can take longer than one hour to activate).
I also noticed that if you delete a user they are still active and can log in to the email and access your sky services.
NOTE: If you do not get an option to create additional users then this is a problem with your account/sky portal. Sky will need to fix this. I believe they are aware.