Those are just some simple instructions -- and they are simple:)
1. Place the desired amount of tuna, mayo, and cheese in a bowl.
2. Mix together. Add more mayo and cheese until you have the desired amount. (Just depends how you like your tuna - how cheesy/ mayo-e) (no, I don't think mayo-e is a word).
3. Meanwhile, toast your bread to desired crispness. Spread tuna mixture on bread.
4. Turn oven onto broiler. Place pieces of bread on wrack and bake until cheese is melted (just a couple minutes).
By the way, it seems that the word desired got used WAAAY to much in this post, but it was an adequate word and it worked:)
So, I hope you all have a wonderful day!