To enable restrictions go to printers -> and select the printer you want to apply restrictions to. In this case the Toshiba 2515AC
Select the printer then select "Filters & Restrictions"
In the Filters & Restrictions
Enable Restriction Scope, and in this case I want to limit printing to a max of $25 or 50 pages. There are other options such as spool size (size of the file being printed), duplexing etc.
Once you have setup the rules on the printer, you can then select the user you want to restrict. In this case Print User
Go to account details and enable the Restricted Checkbox
Once printed if your over one of the limits you will get a warning that the job was denied.