When you print a document, you will need to charge the cost to a shared account.
Once you have selected print, open the Printing app on your iPad. Within the app, a pop-up box will appear, asking which shared account you wish to select.
Click on the drop-down menu and select the Shared Account that you wish to charge the printing to.
Once you have selected the account, click print and you can then release your printing to the MFD.