Plug wire removal

Please help. I have a set of new NGK plug wires and I can not remove the old set from the coil pack. How do I remove the wire from the coil pack? Thanks.

Update: I did get the plug wires off, but every one of the old ones broke. The two pronged retainer; that is incorporated in the plastic part of the wire going to the coil pack, would not un-hook. I tried pressing down and turning. I also tried just to manipulate the retainer and still nothing.
I ended up using a small screwdriver to unclasp from the coil pack, but each time a portion of the plastic clip broke. The NGK's went on each without issue and are as close to an OEM fit/length as possible. I changed each wire one at a time. Truck runs fine and appears to be more responsive. If someone does have a trick to doing this please post...there's definitely a better way...