Add A User To Your Channel
As a channel administrator, you have the ability to control access by assigning specific roles to users on your channel.
Make sure to be logged in to your channel as an administrator.
From your channel’s start page, click on Settings.
Then press Advanced Settings in the top right corner:
You have now reached the channels backend/admin dashboard, now press Settings in the red top menu:
Then press Account settings:

Administrators:

This is where you can add additional administrators or other roles to your channel.
You can review the list of available user roles and their respective permission levels here: Roles