If you want to learn to start triking you need to follow my steps:

How To Trike:

1. Find a smooth 45 degrees rood that is cut off and go to the top with your trike. Better for the sliding of the trike.
2. Make shore you are wearing all the pretective gear you need. Even with the pretective gear on there are still risks of you getting injured. And you can get from as little as a few grazes to Broken bones, or in a neck brace. 
3. If your trike has petals start pedalling if not just get a bit of a push off. The faster you go the better the sliding will be. So preferbly get a trike with pedals.
4. Use your weight to fling the drift trike to one side and hold it to drift longer. If you swing to far you will spin out backwards. To hold it longer you have to force it but not to much or it will spin out as well.
5. If the back of the drift trike is on the left the front has to be on the right, and you should be leaning to the right.
6. You should be holding the handlebars which are on the right but it should be facing towards the left.
7. Same thing if you want to drift the other way just reverse everything.