If you used a mobile-pocket account with an e-mail address tap on the "cog icon" in the top left corner of the screen and then on "Account" -"mobile-pocket Account". Click on "forgot password" and enter the e-mail address, with which you registered. You will automatically receive the password sent to this e-mail addresse, please also check your spam folder.
If you can't see this section, it means you're already logged an account.
If you registered with your Facebook, Google or Apple Account please request a new password directly from the respective platform.