what do i do with number 8 GND , I am using copy chrome kit don’t i just use + and – ?

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1- Power Switch :
Turns the power supply on–off, when it is on the front display lights up.
2- AC Input Socket with Fuse
3- Concealed Fuse box ( ply open the cover to get to the fuse)
4- Output Voltage Tuning knob
5- Output Current Tuning knob.
6- Output On/Off push button
7- Output Terminal Positive (+) Red color.
8- GND Terminal () Green color
Chassis ground terminal, normally this is to be short to (+) or (-) as required by user.
9- Output Terminal Negative (-) Black color.
10- LCD Display panel showing :
4 digit voltage, current meter, (CV) constant voltage mode, (CC) constant current mode,
Output Terminal on/off state
OPERATIONS
Ground Connection