slide your flat head screw driver in there vertically, all the way. Now twist it so it's horizontal. (Whether this step helps or not is debateable.) Now you need too hands for this job! *YIKES* lol.
With one hand on the screwdriver, pull it up and down.
Your other hand is not in your pocket, but on the handle tugging it away from the base. Look at picture if you prefer picture books.