first you need a good tip cutting. like in diagram below. cut it off a little below the third set of leaves and then cut off the third set of leaves too and pot it. leaving the top two set of leaves above the soil line and the 3 cut areas below the soil line.
might help to put a clear bag over it too and keep it in indirect sunlight.
it helps keep the moisture in so the leaves don't dry out while the plant is trying to grow new roots.
then it is pretty much waiting until you hopefully see some new growth/leaves .
which could take 4 to 6 weeks or more.
