I'm not certain what keyboard layout you are using. As I mentioned, with the Default US Keyboard layout, an @ sign is created by tying Shift and the 2 key.
Evidently you are familiar with another keyboard layout. *Blocked Russian URL*/english/layouts]here are some keyboard layout images[/url]. You'll want to change your keyboard layout to the one you are familiar with- there are a few there which appear to have the @ key as a "primary" key label.