Prefab Help.
And by Mexican user, I meant Adlez or whatever. I couldn't remember his name.
Don't use prefabs. Learn to make stuff from scratch and you'll be a better mapper.

I had no idea that it sounded mexican until years after I made up that nickname.
As usual when I get questions about my prefab pack, I have to ask if you have read the documentation?
APP Documentation wrote:
Entity: point_energy_ball_launcher
Name of entity: launcher#_launcher
How to activate:
If you rotate the prefab, set the Pitch Yaw Roll (Y Z X) keyvalue to the direction you want the ball to be launched. A LaunchBall input will launch the ball. If you want balls to be launched regularily, use a logic_timer entity. The Ball Lifetime keyvalue is the time in seconds the ball will exist after it has been launched. The Min life after portal transistion keyvalue is the minimum time in seconds the ball will exist after it has gone through the portals.
EDIT:
You should have some basic knowledge of Hammer and the input/ouput system before you use prefabs. The purpose of these prefabs is to speed up the mapping for mappers who at least know a little about how they work. Don't expect them to work as you want by just inserting them into your map. To make them as versatile as possible, I have made many of them dependent on other entities you have to make yourself. To get some experience, read the documentation and try to replicate the prefabs.
BTW, a new version will be availible soon. The current one has some flaws, both the prefabs and the documentation.
EDIT: Fixed that.