I am using Damus.  I also downloaded the test flight then as per guideline of one of the nostrian I have to download damus beta. I did not proceed bec the term in damus beta said that I may lost the current info from Damus alone. It also state that I have to do back-up before downloading damus beta.  But how to back-up? 

 I don’t think you’ll lose anything. As long as you have it installed and you’ve backed up your nsec it shouldn’t be a problem. 

 Thanks I will try 

 Once you have the TestFlight running, the last step is to run this script and restart the app. 
https://nostrscript.suhailsaqan.com 

 I have to tap redeem then redeem code is required.  Where will I get it. https://image.nostr.build/f8ad6a1cdb452655e5ac6d701120fb13c0bd2aed149919833d543be70b29a55c.jpg  

 Zapr.social .  As a beginner I seek for help how to zap out as in ELI5. Few Nostarians helped me.  But when I tap the apps it is downloading upto 33% only so I cannot proceed.  Perhaps you have different way how to do it?  I am using an apple phone iphone14 https://image.nostr.build/50439c8f8f83501abe6f01614203cd08286c149ba89fd4be6257919d9ad48515.jpg