The old APK page is going to be removed soon from the Google play developer console. They introduce a new page - 'Manage releases'. I have moved to use the new page to manage releases but I cannot find where to manage the alpha and beta testers lists. It is currently still in the APK page, but when this one is removed I won't be able to change the lists... any idea?
When you click the
Manage beta or
Manage alpha buttons on the Manages releases page, the top section is labeled 'Manage testers' - clicking on the drop down in that section will allow you to change the beta testers list.