well dear, the sign glued to the underside of the engine has many symbols (+, -, o). Notice that you can pout the 4 screws on 3 different levels by clicking on them. You need to put them in the order that the sign says. The plus means put it at the highest height. The minus means the lowest. and the o means the middle. Once you have done this insert the spark plug from red into the whole near the hood of the engine. And you're off. Good luck dear!

okay
When you open up the motor you can look at the top right. well
the plus sign means up
the o means in the middle
and the - means at the bottum