Ok, I was looking some more and I have found several kits using the XP battery that are sold with the Innokin iClear 30 tank, and it has a swivel drip tip, so I am going to guess that's what you have. Here's a photo set of an Innokin iClear X.I, which is very similar.
Remove the tank from the mod, it just unscrews, so it looks sort of like this:
Turn the tank upside-down and take the base off, like this:
The juice goes in the semi-circular holes on either side (seen right side this photo),
not the round hole in the middle:
Hope that helps.