Hello @kamal5117 Kamal.
When creating a new account (AUX address) in the wallet you are required to first of all type a password and then also repeat the same password to verify. The account is then created.
You are the only one who has the password. That is a decentralised aspect: the passwords are not stored. Users have full control and responsibility over their funds.
I hope you can find the password somewhere. Maybe it’s the same as you use for other accounts?