Turn off the pi
It is recommended to shut down the pi before connecting the camera.
Locate the camera port and lift the tabs
The camera comes with a flex cable that must be inserted into the camera port. In order to do so, you must first lift up on the tabs.
Insert the flex cable and lock the tabs in place
Using the image as a guide, insert the flex cable into the port so that it's fully seated. Then push the tabs back down, locking the cable in place.
Next: Use picamera to take pictures with your Raspberry Pi
Learn how to use the picamera Python module to take pictures with your Pi.