I Have a frosted white glass table that i want to change the colour to a black frosted look, can i paint over the white? Would this work or how else can i turn it into a black frosted glass table?
No, it's not easily changed. I strongly suspect that you'd be better off living with it white, or trading it for a black one, as any paint-based solution will be far inferior to actual colored glass in appearance and durability.
The best possible paint option might be to paint the bottom black, but it may not give the look you want - however, painting the top black will give you simply the look a black painted surface, not a "frosted glass surface" at all.
You might want to use plasti-dip (or something similar) if experimenting with paint - it can be peeled off most surfaces if you change your mind.
But I'd suggest leaving it alone as being the most likely to succeed.