Once you have added a new user to your account, you have the possibility to assign them the role of administrator or manager.
To start, access the list of your account's users.
Then, you need to choose the profile you want to modify and click on the pencil to edit it.
Once you are on the given user's profile, you can assign them the designated roles.
The Admin role enables you to make the user an additional admin (they will then have the same status as you and have access to the Admin-only section: Subscription, Settings, Billing profiles, etc.).
The Manager role enables you to make the user a trip approver. If the Validation Module is not active, the Manager role will have no function.
Save the changes and you're done.
Note: The roles are cumulative. It is also possible to make administrator and manager assignments when you first create a user in essentially the same way.