AxCrypt will use the AxCrypt account password to encrypt/decrypt the files. The account password is used/involved to encrypt the files with the AxCrypt app.
If you do not remember the password to your account, you can always reset it. This is not a way to recover encrypted files! It’s only to allow you to sign in to the AxCrypt app and web. The new password will be used to encrypt new files. Go to https://account.axcrypt.net/Home/PasswordReset to do this, or you can also go there from AxCrypt with File | Options | Password Reset.
For more info about Password Reset: https://www.youtube.com/watch?v=O6whtjSb3pc and https://www.axcrypt.net/blog/password-reset-axcrypt/.
Still, if you are facing any issues, please write to Support@axcrypt.net. we are happy to help you.