My Zosi DVR only have 4 port channels but displays 6 channels on the screen is there a way I can have channel 5 and 6 ta play

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A set of 4-channel DVR/NVR can allow you to have 4 individual security cameras connected to the system. This means you can record maximum 4 cameras.
6 channels mean you can expand the system in the future.

Please go to"Multi" to select the channels you want to show.

If you bought a Zosi DVR system without a hard drive, it doesn't support the external hard drive, so you need to buy a professional surveillance internal hard drive to install.
It is not recommended that you purchase a desktop hard drive. A surveillance hard drive or security camera hard drive is more durable, advanced, and reliable than a desktop hard drive in a lot of ways.
Here a list of surveillance HDD manufacturers:
Toshiba_ (S_300)
Seagate_(SkyHawk)
Western Digital_(Purple)

I'd recommend you buy Western Digital Purple 1TB or 2TB hard drive.
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