like this, so I haven't tried oxchat, I just wanted to try it then I was directed to playstore that's where the problem is I want to download on playstore but can't 

 Besides the Play Store, you can also download the APK from GitHub or from zap.store.

https://play.google.com/store/apps/details?id=com.oxchat.nostr

https://github.com/0xchat-app/0xchat-app-main/releases/tag/v1.3.3-beta  

 saya belum mengerti caranya mengunduh melalui github 

 This is the APK download link

https://github.com/0xchat-app/0xchat-app-main/releases/download/v1.3.3-beta/v1.3.3-beta.apk 

 on my android smartphone device it was detected as unknown, maybe my device is not capable of beta testing