Select from the Tabs at the top of the screen 'Users'
All current users will be listed, click onto the name to edit
Click on the Add button at the bottom of the screen to add a new clerk / user
Complete all necessary fields and create a username, a link will be sent to the user to set up their own password, you can select the user role i.e. clerk / manager from here
Click the 'Save' Button once all information has been entered