I like the tooth pick method best. Get a tooth pick, put the tip in the white hole in the top of the carto ( so when you fill the carto with juice to prime it, there wont be any juice in the air hole (the white hole on top) Fill the carfto up about three times and let it soak down, like RJ said, it will get "slushy" om top. That will take 8 to 10 minutes. Just filll it, let it sit up right, about three mins later fill it again, repeat until slushy up top. The priming is the most important part of the life of the carto. Once its primed, your good to go for several days.
My best luck was with a dual laser punched carto. I liked the 3.2 ohm cartos by smok and usually vaped fruit or clear juices at 3.5 to 3.6 volts (10 watts) That 3.2 ohm Carto seemed to last longer than a lower ohm carto. In old Protanks and evods, I liked a 1.5 to 1.8 coil, but not in a carto tank
Be sure the get the right lenght of a carto for that tank. IBTank makes three sizes. It appears that you may have the XL lenth IBTank. Thats a really really great tank. It should not leak, even if the seals are a year and a half old.
As RJ said, Just put a tad of juice on yout seals, or even easier, on your carto and just slide it on.
You also dont have to worry about a flanged or a non flanged carto to go into that tank. The seals are one of the best parts of that tank and it shouldnt slip and slide, even picking a heavy mod up by the tank itself.
When you want to re fill, just slide the carto down into the tank just enough to drip in your juice, only fill the tank 80% full and slide the cato back up.
Back in the day, I had 12 IBTanks all filled with diff juices and would keep them in a zippered pouch and change the tanks out all day long for diff flavors.
Before the Kayfun came out, only a dripper had a better taste than a good carto set up in my opinion.
WOW....... How did I remember all that. I remember when Train and I used to sport IBtanks and SVD's ...... ahh,,, the goood old days.