This application has no UI. It is a very very small utility application. Go to play store and click on any of the apps you find. Scroll until you find the "Share" button. It is below ratings and reviews. Press share and choose me. You will be redirected to beta testing enrollment web page. Most apps do not have beta testing setup but it is good anyways to try them.
The download of this application doesn't contain viruses or any kind of malware. The app is created by Said Tahsin Dane and its category is Tools. Over 100K users downloaded and installed App Public Beta Checker and its most recent update was on Jan 21, 2018.