You might be able to bend the metal back but if not then you'll have to buy a new keyboard. You can sell the old one on ebay for about $15 even though it's missing that key. If you are able to bend the metal back, you can buy a replacement key on eBay for example: http://www.ebay.com/itm/281064247677?ssP...

If you have a bluetooth card in your computer then yes

I recently had to order some keys myself, here's a place selling them for $2.50 and they ship internationally too! http://www.ebay.com/itm/281064247677?ssP...