Forum:How to add Templates

I would like to create an Infobox similar to Infobox game w/ less details. For instance I do not wish for their to be Playing Time, random_chance, and skills in  the Infobox. I plan to use it in Lego The Lord of the Rings. Here Is the code, by my understanding I believe it should work. How do I physically Add this to be An infobox/ Template.