It means read it :P
Then you will learn not only how to do it, but also other new things
Sorry to say but the younger generation of today dont have patience or the willingness to learn fully lol :P
But from the few mins I looked into WMM, it seems you have to segment your movie then change the speed per segment. If you want to go into changing speeds on the fly you may have to look into the realms of Pinacle Studio or something similar.
You know saying that makes you an old man?
actually dabhaa.. or w.e.
i did read the manual thing.
it tells me the 1st part. the bit about how to speed time,
but not wen to start and stop it.
ACTUALLY
Take my advice and use Sony Vegas.
And dahbaa lol, even more that you are British and don't get it.