I'm having trouble filling up my new e CIG. I've already wasted 2ml of liquid. My vape pen is different from the others the cap at the top of my e cig or the mouthpiece is non removable so I'm assuming I have to unscrew my ecig from the battery to fill it from under the atomizer? But whenever o go to do that I put the liquid around the hole so it doesn't clog the vape hole, but it doesn't drip into the tank. It just stays there. I really need help please