My cat tore the button off the key pad while trying to put it back on I broke the little metal tab that holds the key down. Do I have to buy a whole keyboard or can I just replace that one metal bracket.
If you are talking about the metal tab located under the key then you’ll have to replace the whole keyboard. The key will not stay in place if one of the metal tabs is broken.
When one of the keyboard keys gets disattached, you can install it back on the keyboard using these keyboard repair instructions.