In your project, navigate to User Management > Users. Then click on the user whose password you would like to reset.
Go to the user's Account Security tab, and click on Change Password. You can also require the user to change their password on login by enabling the Ask to change password on login toggle.
You can either enter a secure password you wish to set for the user in the Password field, or click on Generate to have Authgear automatically create a new password for the user.
Check the "Send the password to user's email" box to enable Authgear to send the password entered in the Password field to the user.
If you wish to force users to change their password upon logging in with the password you set for them, enable "Ask user to change password on login". Otherwise, users can continue using the password you set for them.
Finally, remember to click Change to save your changes.