oh, oh dear. At the tip of the grip or tube, is the needle, you should have ink pots in a holder, pour your ink into the pot and dip your needle into it, get tattooing an when the amount of ink that is being transferred to the surface of the skin starts to thin out then you re-dip, making sure to wipe the excess blood and ink from the needle.
First thing it a machine an the second if you need to ask you don't need to be doing it
You take the ink bottle and put it in the gun. (DUH)