No wiki, but if you search the forum, there are a few threads on it. (Try searching for 'clogged nozzle' too)
WARNING: VERY HOT
Empty the filament, and disconnect PTFE inlet tube. Bring the nozzle up to temp. That's actually easier now with latest FLUX Studio, you have manual temp control.
Then unplug or switch off power. Quickly remove tool head from the machine and use appropriate wrench/spanner/socket to take off the nozzle. Do NOT try to do when it cools off or you will VERY likely break the hot end or tool head assembly.
Try not to burn yourself (too much).
Reverse the procedure to put nozzle back on.
Has to be done while hot to account for metal expansion coefficient whatnots, because Science...
From experience, having a leather glove, some forceps or pliers to hold it, and some aluminum foli or metal canister to put it in to protect work surface are all worth having on hand before you start.