If he's trying to make a bot:
Make a brick, wrench it, click Events, then click on the little box on the top-left of the window. Click onBotTouch, then on the other dropdown that pops up, click Bot, then on the other dropdown that pops up, click changeDataBlock, then on the other dropdown that pops up, click Standard Player. Now, make a vehicle spawn brick and wrench it, click on the text that says NONE, then on the dropdown that pops up, click Horse, and press Send. Now jump on top of the newly spawned horse, and then run the horse on top of the brick you previously made (that you wrenched with the onBotTouch stuff).
