I'm not familiar with that atty so I looked it up. It appears to be a bridgeless atty, that's great for flavor. It will however not hold quite as many drops as one with a bridge does.
Not being familiar with that particular one the first thing I would do is make sure any priming fluid is out of it. This is done with PG, VG or the juice you intend to use first. Make sure you have a paper towel, then drip 4 of 5 drops in the atty and then gently blow it out from the top. It will come out the holes above the 510 threading so make sure you have the paper towel ready. Do this a couple of times and your ready to go. This is also the same process done between flavors but only using PG or VG.
Now you're ready to vape so 3 or 4 drops should do it. If it is leaking out the holes by the threads you have put too much in, you can blow a bit out as described above. When your vape gets a bit dry add a few drops. It takes a little getting used to but the flavor should be awesome.