The ones on top of the air box are secondary injectors. The clip is below the connector. You can take a slim screw driver and run it under the metal clip and lightly push the release tab, then lightly pull the connector off the injector.
that connector in the open is the one that goes back on the injector in the air box.
see the metal tab on it? you push it in and pull the connectors apart. Once you remove the one just hanging there, you will understand how to release the one attached to the injector on the air box.
here is a video of a guy replacing a broken one.. you only need to see the metal tab push release I am talking about to understand.