Please help me!
I cannot change the password of PBE account! please help me!
I cannot change the password of PBE account! please help me!
did you try Riot support?
If you need to recover your password, follow these steps:
Visit https://community.pbe.leagueoflegends.com/ Click on "Login" in the upper right hand corner of the page. Click on "Forgot Password?" on the bottom of the window Enter your Username You should receive an email shortly for further instructions. If you still can't to recover your password, send us a ticket!
Source: https://support.riotgames.com/hc/en-us/articles/201751904-Public-Beta-Environment-FAQ#h2q3