Question: I am ready to send my first app to beta testers, so i click on '**Manage Beta**' > '**Manage testers**'

![add a new List with one tester in it](https://i.stack.imgur.com/omaHR.png).

and '**Save**' and '**Resume**'

APK is uploaded > '**Review**'

The review summary says '*This release is ready to be rolled out.*', but the button labled with '**Start to rollout to beta**' is disabled: ![disabled button](https://i.stack.imgur.com/TH9Bd.png).

Answer: 
Make Sure the following are checked

[![enter image description here](https://i.stack.imgur.com/WT4NU.png)](https://i.stack.imgur.com/WT4NU.png)
You also need to make sure that you made it available in at least one country.
By default not one country is selected!