You can manage all your testers on the Tester & Groups tab within the Distribution page of your App.
On the Tester & Groups page you can:
Add new testers with their e-mail adress
Import Testers from a .csv file
The CSV file must contain the tester's email address only. For example:
All added Testers are automatically added to your distribution list of your app.
You can manage all your distribution groups on the Tester & Groups tab within the Distribution page of your App.
A distribution group is a set of different testers and all of them will have access to install a distributed release. An example of a distribution group can be a team of users like Projectmanager, Marketing, QA-Team or external testers.
To create your first distribution group go to the Tester & Groups page
Click on Add Group
Give a Name to your Group and click Save
Add your testers to the group by typing in their e-mail adress and click enter
All added Testers within your Group are automatically added to your distribution list of your app.
All your Testers & Groups are added to the distribution list on the Distribution Page Overview.