Instructions
Turn on your console, then insert the Call of Duty: Black Ops video game. If necessary, log in to your user account. On the Xbox 360, you need an account that includes Xbox Live Gold in order to play the multiplayer component of Call of Duty: Black Ops.
Select the "Black Ops" icon from the "My Xbox" or "Games" menu, then choose the "Multiplayer" option and specify the game type that you wish to play.
Begin playing a game, then either earn a care package killstreak box, or wait for one of your teammates to acquire one. If you have earned the care package box, you will need to press the "Right" directional button on your controller to bring up the care package grenade, then press the right trigger to throw the grenade.
Approach the killstreak box after it has been dropped, then tap the "X" (Xbox 360) or square (Playstation 3) button twice to change the care package box contents.