what are you having trouble understanding about it?
and probably belongs in the modification section
Now, for collision. This has to be a low poly outline of your model, preferably just a cube. And in order for it to work you must make a new empty and name it Col0. Then parent your cube to Col0 and parent Col0 to shape. If you don't know what i'm talking about go to the weapons/items chapter.
Make sure you name your cube Col, I don't know why but the game will start complaining in the console that it needs to be named Col, or LosCol. It does no harm but people don't like having console spam in their console.
what of this have you done?