It is in the same place as on the regular key board, to the right of the "/" key and under the Enter key.
It's just for convenience, I believe. Because when you are typing, each hand is close to the shift key.
Hold down the SHIFT key (immediately below Caps Lock key on most keyboards)
The key combination [Shift]+2 should do for standard keyboards to type the "at" (@) sign.
Just press the left SHIFT key and press the number 8 key
To type the hashtag symbol (#) on a QWERTY keyboard, press the "Shift" key and then the "3" key simultaneously. This combination will produce the hashtag character. On some keyboards, the layout may vary slightly, but the Shift + 3 method is standard for most English QWERTY keyboards.
Just press SHIFT key...
To type the "@ symbol," press and hold the Shift key on your keyboard and then press the number 2 key (usually located above the letter Q on most keyboards). This combination will produce the "@" symbol on your screen.
The underscore key is typically located on the same key as the hyphen (-) on most keyboards. To type an underscore, you usually need to hold down the "Shift" key while pressing the hyphen key. On standard QWERTY keyboards, this key is found near the top right, between the number keys and the letters.
On the most common keyboards (qwerty) an underscore is created by pressing the shift button in combination with the "-" (minus) key. Example of underscore: _
Shift plus 8 produces the asterisk symbol (*), which is often used in mathematics to denote multiplication or as a wildcard character in programming and searches. On most keyboards, pressing the Shift key while pressing the number 8 key will yield this symbol.
shift 2 = @
As with any other operating system, you would type an underscore by pressing the key on your keyboard with that character. On most keyboards, you can type an underscore (_) by pressing Shift and the hyphen key.