When you create a Campaign, you are the Owner. You can add team members to your campaign to help you review and manage the campaign.
Navigate to the Campaign Team in your campaign
Tick Edit Team
Tick on User Name or the Plus icon to add
All team members have the ability to select content, audience and the delivery method. They can also make your Campaign Live, the Owner will still appear as the sender.
To remove a team member
Navigate to the Campaign Team in your campaign
Tick on User Name or the Minus icon
To Note
The Owner retains the ability to change sharing settings and can change the Campaign Owner to another user