All you need is Google+ or KakaoTalk to support INFINITE at Show Champion this comeback.
To install the app on ANDROID, download the installation package, open it and follow the instructions. You might be asked to change a permission setting so it can install. APKPURE DOWNLOAD
When you open the app, tap on any photo to see the login page. No need to create an MBC account. Log-in using your Google+ or Kakaotalk Account.