Beta version in Android play store. Where's the opt-in link for testers?

Question

How to publish beta test-version in Android play store ?

I'm trying to allow beta test my phonegap build app in the android play store. I already uploaded a signed apk in the beta tab and added a google+ group with some users inside ... but I'm slightly surprised that I cannot find how to install or even find this app on the testers smartphones. I opted myself as user in the group but cant see a link to the app or something like that. Shouldn't the app be already visible to beta users in the app store? Or do I have to push the publish button? The info popup tells:

"Your app can only be used by your testers when it is published to Google Play.  If your app has no production APK then it will only be visible to Alpha and Beta  testers. The link that your testers can use to opt-in will be displayed here when  you have published your app." 

Sounds to me that it should be published. But doesn't it mean that the beta apk will be moved to the published-area and not being then a beta any more? I'm afraid that the app will be then visible to all users in the play store not only for my beta testers.

Could someone explain me how to publish a beta for my testers only?

EDIT: It seems that everything I need is the opt-in link that is missing. Any idea why?

Answer 1

In order to be able to get the link to share with your group you have to first press the "Publish" button in the upper right. After doing this you will see the link to share with users appear as brheal shows above.

I'm adding this graphic to the discussion to help clarify exactly which one to press and which to not press.

Per the discussion above I was still a bit worried about pressing the publish button. I just did it and it works.