Yon can set a password for a print job so that it starts printing only after entering the password on the printer's control panel.
On the printer driver's More Options tab, select Confidential Job in the Job Type and then enter a password.
Set the other items on the Main, Finishing or More Options tabs as necessary, and then click OK.
Click Print.
To print the job, select Print Stored Documents on the home screen of the printer's control panel. Select the job you want to print, and then enter the password.