Why would the 'at' key on a keyboard not work?

Shift + 2 = @ There is no "at" key on the keyboard. The "Alt" key, located directly left and right of the space key may be what you're looking for, or perhaps you are looking for the "@" key, which can be printed by holding down either the left or right shift key, and then clicking the "2" that is directly above the "Q" and "W" keys. Other possible problems include: 1. Your keyboard is broken 2. The input area is not selected.