WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
To release the lock, pull the lever (A) while pushing the lock (B), on the outside of the connector, then pull out the connector (C).