how to find login associated with a specific password?

Hi dldvorak - I can certainly help you with this.

The password fields of your Login items are included in Search. You can type the password (or part of the password) into the search bar in any of the 1Password apps and the search results will include any Login items that use that password.

You can then Use the password generator to change and strengthen your passwords.

I'd recommend using a unique password for each of your items as re-using passwords presents a security risk.