Firstly you only do a coolant check/fill when the engine is stone cold and you do not have it running...best first thing in the morning.
Open the rad cap see where the float is, when correct it should be level with the top of the threaded neck, if its down below the threaded neck not enough, if it pops out to much..dont worry if it pops out due to to much it will bleed itself, however it will pop out if the engine is even slightly warm, hence do the fill/check when stone cold..
To fill, aircon on full heat and lowest fan setting, then start the fill slowly until the float reaches the top, open the bleed screwto expell air....now replace cap, do up the screw and start up and see what happens.
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