3.6/3.7V (the middle one). That's where you want it for all IMR batteries used for
vaping.
With 18650s,you can pretty much use whatever amperage setting on that charger you like. The VTCs will handle 4A of continuous charge current. The .25A setting is "best" for the health of the batteries, that's where I'd leave it. I only use 1A for a quick top up if I'm in a hurry.