Admin > Settings
Once you have a user created, you need to assign them to a Division. A Division belongs to a Business Unit
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To do this you click your user and then the relevant division as shown below:
In this example, Artyom is being assigned to the Head Office Division at Edge Technologies.
Next, you can determine the permissions for the user in that division. Expand the BU and Division as shown below.
Read the article on Roles and Permissions to determine what to tick.