Access the User Management page by clicking on Configuration / Users Management.

To reset the password of an existing user, click on the "reset user password" :

A window containing the new password appears. This password must be sent to the user so that they can log in to the application.

When you confirm, you are redirected to the User Management page.

Note : You cannot change your own password on this page.

Please go to 'Edit my profile' to update your password.