Alternative to the condom fill is a top fill.
Remove the translucent end caps (condoms) and you should see a standard cartomizer -- 510 battery connector at one end, and the mouthpiece at the other.
The mouthpiece has a white rubber insert, hole in the middle. Pop it out with a paperclip, tack, fork tine,...
Put a tissue over the battery end, lean the carto about 45 degrees (diagonal), drip liquid into it. Rotate the carto a little and repeat, twice, so you have juice saturating all the filler.
Wipe the tube, blow through the mouth end into the tissue, to clear any excess liquid.
Put in on the PV and vape. Replacing the white rubber end cap is your choice -- if you have problems with getting liquid in your mouth do it, but after a while you get the hang of it, and it's easier to just leave out the rubber tip.
Syringe and needle aren't needed with standard boge -- you just want to thoroughly soak the poly filler surrounding the central tube, top it off when you notice it is running dry (less vapor/flavor). After a bit it becomes easy to refill with them still attached, once you get the hang of how much liquid to put in.
On the first fill you may need to top it off again fairly fast. What I find is that the first draw or two tends to pull the initial liquid in, and it needs a bit more to really get going.
I condom filled for months, but found top fill simpler and faster over time, less mess. Both ways work fine.