Hi flame
Basically, what you're trying to do with the drip method, is introduce your existing tank water to your new addition with a slow water drip.
I use a short (~2m) length of flexible airline tubing (green silicone tubing works best, 3/16" diameter) with an adjustable valve inserted somewhere along its' length.
With one end in your tank, start a siphon, and place the opposite end in your fish bag (I usually have the bag upright in a bucket, with a puncture at the top of the bag, to allow the tubing into the bag). Adjust the valve so that the water slowly drips into the bag. The drip should be slow enough that it takes at least an hour to double the existing bag water.
Does this help?
p.s. How's your flame doing?