One of the things that is confusing you/us is that Sweet-Vapes calls the Vision Kit "cartomizers" and everyone else in the free world calls them clearomizers. Cartomizers are what elfstone shows in his 2nd pic above.
I linked a video above that shows how to fill and use the clearomizers, and elfstone gave you a video on how to fill the cartomizers.
For the atomizers, if you have any vodka or everclear around, you should rinse the atomizers in some and then dry them. You can let them air dry or you can use a hair dryer with the heat setting on cool. Blow through the open end of the atomizer to blow any gunk out. Then drip 4 or 5 drops of juice right in the middle of the atomizer. Put a drip tip on the open end of it. Screw it on the KGO.
Put the drip tip to your lips. Push the button on the KGO. Take a short, easy draw and do NOT inhale. The first 2 or 3 hits from a new atomizer can still have some primer in there (in my limited experience with them). Just puff and blow it out without inhaling.
Then, when you are ready to take a hit and inhale, take a short, easy draw. On the next hit, take a little longer draw, but still easy. You don't want to vape like you would smoke a cigarette. Longer but easier hits is the name of the game.
After 4 - 6 vapes, when the taste of the juice seems to be getting lighter, drip another 2 or 3 drops into the atomizer. Some people drip right through the opening in the drip tip (that's where the name "drip tip" comes from). I prefer to take the tip off and drip directly into the atomizer and then replace the drip tip.
If you don't drip more juice into the atomizer when the taste gets weak, you will eventually get a horrible, acrid burning taste. Inhaling it is just brutal. After you do that a few times, you'll pay more attention to re-wetting the atomizer before all the juice burns off.
Repeat as necessary or desired.
Hope this helps.