Create a Device Password - BlackBerry® Bold™ 9650 Smartphone
If the device is setup on a BlackBerry Enterprise Server (BES), the option to enable or disable the password may be unavailable. Contact the BES Admin for assistance.
From the Home screen All tray, select the Options icon . To expand the tray, press the Menu button (located at the bottom) then select Open Tray. Utilize the trackpad to hightlight then press it to select.
Select Enable. Enabled when a check mark is present.