If you got a 306 drip tip with it, just put it on and drip down into it.
These need to be primed properly. I think they say to drip 5 drops and let it sit for 20 minutes. Then drip 3 more, blow it out, and then drip 3 more and vape. I dont think that is exactly the right way, but that is how I do it and it works.
if you dont have the drip tip, just pull the cart off, and drip right onto the bridge sticking up, or into the gap between the bridge and the cup where the coil is. I do this by tilting the atty slightly and dripping into the slot.