by changing the password or forget the password
When you have Confluence or Jira using Crowd to manage your users, those user accounts cannot be reset from these other applications. You can only change/reset the user passwords from within Crowd. There are details about doing this in Crowd: Changing your Password - Atlassian Documentation
From that page:
If you are authorized to use Crowd, you can log in to Crowd's Self-Service Console and change your password, as described below. If you have forgotten your password or your username, you can ask Crowd to email your username and reset your password.
That said I did come across a feature request for Confluence to automatically redirect users to Crowd when they either forget password or want to change it. Please see https://jira.atlassian.com/browse/CONFSERVER-57908 for more details.
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