Can i run my arduino board on that charger
If the 5V is well regulated, connect to the 5V pin to power the Arduino.
Only power through the 5V pin and USB at the same time if you know that the board can handle that (some can not, make sure that yours can).
Else you could power with the 7V, 9V, 12V through the Vin pin, though I would not recommend it. If powering through the Vin pin the 5V is derived from the on board 5V regulator. That regulator is not heat sinked so will overheat and shut down (best case) if too much current is drawn. The higher the input voltage, the lower the amount of current. If you want to use a higher voltage, connect the higher voltage to a buck converter to drop to 5V and connect to the 5V pin.
I do not understand why there is 4 output voltages quoted, surely this is not USB 
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