How to reset the user password

How to reset the user's password? I log in with admin and want to change the user's password in the account page. However, it does not work.

Is there any easy way to reset user's password if I use my admin account?

https://doc.owncloud.org/server/10.0/admin_manual/configuration/server/occ_command.html#user-commands
You can try user:resetpassword occ cli command, if you have terminal access to server.