Just put new juice in your tank ;)
There's no trick to purge the old flavor from the atomizer?
it really depends on the flavors you're switching around since some heavier flavors (pastry, caramels, etc) can stain and flavor the cotton in your coil. This will cause the coil to taste like that flavor for a long time, so the best advice is to go from light to heavy flavors if you can. Past that you could try vaporizing the remaining juice that's in the coil after refilling your tank. You'd just need to fill your tank with the new juice and you can fire the mod in short bursts while pushing air through to do that. This could be an issue with the life of your coil if you do this too much or too many times but you just need to be sure to let your coil soak through after you do that. Maybe also look into an RDA or RTA since those are made for switching out flavors a lot
Thanks guys, I know what to do now.