It is easier to use ready mix OAT, the F & TF system takes 10 litres and make sure that you bleed it correctly at all THREE Bleed points, Radiator, Heater Matrix and engine rail. if you buy concentrate, dilute it 50/50 but only use de-ionised water NOT TAP WATER.
If changing from Eythl Glycol (blue) coolant, then throughly flush the system with water before re filling. there is not a drain point !! you have to disconnect the hoses at the engine end of the steel underfloor pipes..
it is a good idea to crush a couple of dishwasher tablets and put these in the expansion bottle and run with this for a few days before draining.
replace the pressure cap on the expansion bottle at the same time as the refill and only use an OEM one! the cheap ones are rubbish.
Good luck