I just rub a small amount on my hands as I knead the fondant, repeating until the fondant feels smooth.
I never find that it takes very much if the fondant is OK to begin with. If you add a lot, you ruin the consistency of the fondant and it will be worse than ever.
all good answers--i'm one who recommend cornstarch kneaded into fondant for making things like flowers & bows etc.but not for covering a cake--
sometimes all you need to do is let the blob of fondant air dry a tad -- like for black or colored or sticky fondant that often works for me --
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