[ppbon]

... you pry out the plastic piece with the Delta (I guess you already did because you're looking at the connector.
Then, using two small flat screwdrivers, wedge them into each one of the tabs so they release.
Now using small pliers, grab the white plastic and pull out.
The trick is to have both tabs actuated, then pulling the switch doesn't require a lot of force.
Happy Boxstering,
Pedro