These simple steps will guide you through how to add an existing user to an audience group.
Go to Hub Admin by clicking on the Burger Bars at the top right.
Select Audience from the options on the left hand side of the page.
You will see a full list of existing audience groups.
Choose the audience group you wish to update and click on the 3 dots under actions and view users.
Click on Manage Manual Users, this will then populate a list of all users in the system.
At this stage, you can either select multiple or single users to add. Once selected, click on update in the top right corner.
This user or users will have now been added to that audience.