A user's password can be amended by following the below steps:
Go to 'Admin' > 'Practice' > 'Users' > Filter User > Select Pencil. See below:
This will then allow you to amend any of these users' login details. To update the password, simply change the text in the password field and select 'save'.
Please Note: when you go back into this user's details the password will appear longer than it is the reason for this is because the password is encrypted for security reasons.