Sure. Please check Roundcube password plugin config file.
It's recommended to show us basic info of your iRedMail server like below, so that we can give you prompt answers.
==== Required information ====
- iRedMail version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Linux/BSD distribution name and version:
- Related log if you're reporting an issue:
====