From experience i wouldn't recommend Magnatec in a Fazer, but otherwise this is a very informative video about oil and changing it.
It's a different bike but the same difference, it's still just a container that holds oil.
When draining the oil start engine for a couple of minutes to warm it up a bit, and have bike on side stand.
FZS600 hasa 2.5 litre sump, and a bit more oil needed if changing the oil filter as well, but when the bike's on level ground and now on the centre stand just fill up about two thirds of the way up in the oil window, between the markings.