Custom animation for custom model? [Question][Unanswered]

I have a model, I like it, I think it looks cool... but it would look even more cool if the animation I made for it could play! The thing is... I don't know how to do that! I know AnimationController is need for playing animations for NPC's but I don't know how to put my animation ID into the controller! Is there an input box where I put the animation's ID or do I have to make a script? THIS IS A QUESTION... NOT A REQUEST! If you know the answer or an easier way to do this, please comment! Thank you!!!