The keys appear at random places. You may find the key in one room, but next time you go into a dungeon, it may be somewhere else. Just look around everywhere. Oh, and you must distinguish keys not only by color, but also by shape - so that would not just be "the yellow key", but "the yellow square key", "the yellow circle key", etc.
If it's to do with Dungeoneering, Find a door with the matching shape and colour.
The keys in dungeoneering appear in random places, so you just have to search for them.
You kill chaos Dwarves there I think, and they drop the key.
sorry you cant make keys on runescape unless of corse it is the crystsal key.
There isn't a key for it unfortunately.
I am sorry, but you can not actually answer this question, because there are many tunnels in RuneScape. Especially for members there are a lot. There are also different keys, for different places and different quests.
In pikachu's snatch
you go through it to find the key to the gym
A brass key.
The white key is actually the yellow key which is located in wavi beach.
The sentence "Use the blue key, not the yellow key" should use a comma before the phrase "not the yellow key" to separate the two contrasting elements.
Buy it, get it from the Hill giants.