How do I become an authorized user on a Comcast account ?

I am trying to become an authorized user on my wife's Comcast account but I do not know how to do it?
ETA:56 minutes·5 steps
Info needed: Email address on the account, Password
Follow the steps below to solve this issue. Don't have the patience? Have a GetHuman pro do it for you.
1
You must be an authorized user on the Comcast account in order to make any changes on the account. Follow the steps below to authorize yourself. Step 1: Log-in to the user account http://xfin.tv/1YRfnJw Required information to authorize yourself on the account: Username Log-in password
2
Click "Users & Preferences"
3
Click on the plus symbol and click "Add user"
4
Enter in the information provided below for new authorized user: User's first name & last name Create a new username for the authorized user Create a new password for the authorized user Select the secret question as well as the answer to the question Agree to the terms and conditions
5
Click "Save" and you will automatically save the user's information and add them as an authorized user.
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