After you remove the rubber boot, I believe you can just remove the electrical connector by squeezing the sides and pull back. I'm pretty sure you have to squeeze real tight to release the connector lock. When you re-plug the connector, there should be a 'click' sound which means the connector is engaged.
If you want a real good luck at the driver's side, removing the air box will help get a better visual. A few bolts and the box is removed. Study the orientation and placement of the clip in relation to the housing and it'll make sense.