On a DELL just gently life the key then snap the right and then the left side of the key back into place. Might have to try it 3 times before it snaps back in. It it doesn't work then the key is damaged. You can call DELL with the model you have and they'll send you a free key back, if you're still under protection plan though. Then they might charge you $2 or $5 bucks for the key. They might if you're still under the protection plan send you a brand new keyboard and also dispatch a tech out to come and install it for you?