When I weaned the kits, I use a small plate (paperplate works well) and put a spoonful or two of canned food (kitten) and add warm water to it - enough to make it a little soupy.
Then I either take each kitten and put a little on my finger and get them to taste it or line them up and gently push their face in the food - they will sit back and lick it off.
A few days of doing this, they will catch on - you may have some that just go for it and some that want no parts for a few days.
I do keep mom out of the area till the kits get some food; otherwise she eats it all. After 2 weeks and the kits eating well on their own, we add some dry food to the mixture.
Let the kits stay with mom till they are 10-12 weeks old - at first they will still want to nurse more then eat on their own, so you don't want to ban mom completely