Press the Info button to bring up the Information display. Press the <i> button to place the cursor in the information display. Highlight the current release mode and press OK. Select the Continuous mode and press OK.
This lets you shoot at up to about three frames a second, depending on the shutter speed, noise reduction settings, and autofocus settings. You cannot use this with the flash.
The camera will shoot pictures as long as you hold down the shutter release button (until the buffer and/or memory card fills up). As you shoot, the viewfinder will show rNN where NN is the approximate number of further pictures you can shoot until the buffer fills up. In JPEG mode you should be able to take a hundred pictures before the buffer fills. The number will be smaller in RAW.
In AF-S and AF-A, the camera will not shoot the next picture until focus is acquired, so when shooting moving subjects or panning the camera, you may not get full speed. Even in AF-C, the camera may "hiccup" occasionally.