For a guide to PTZ'ing your camera on an L series NVR please click here.
If you are not able to see the icons described on the link above you will need to update the firmware on your NVR and PTZ camera to the latest firmware.
Once your equipment is using the latest firmware the NVR will automatically detect that the camera is a PTZ camera and add the correct buttons to the live OSD when the PTZ camera is displayed in full screen.
The latest NVR firmware update can be found here
The latest PTZ camera firmware updates can be found here