If your print job pauses the first time after installing the new printers and you receive a box stating Hold for Authentication please click the circle with an arrow to the right of that message.
You will then receive a prompt to enter your username and password. After entering your username and password, click the checkbox to save in keychain. Clicking that checkbox will prevent you from being prompted to enter your username and password again.
If you need further assistance, let us know. Click the new ticket button in the bottom left and we'll help you out!