[Forseti]

I have a tilted key that I want to fix, but I want to know if it would be safe.

I am too afraid to pop it... I mean what if it won't go back on.

[icruise]

They should pop right on and off, but you can break them if you're not careful. Basically you put your fingers under the top of the key and pry it up, pulling up gently until it pops off. But I can't take any responsibility for what happens...

[LosJackal]

It pops off and goes back on very easily. It clips at the top, so be careful to lift it straight off. Don't twist or slide it in any direction.

Putting it back on is as easy as pressing down on it. This is for regular letter keys. Some of the others like the spacebar have a metal bar as well.