Plastic piece covering the signal relay

I have a 2014 Prius C and trying to install the signal relay to prevent hyper flashing. I saw in some of the forum picture that you disconnect the blue plug and connect it to the new relay. The problem is that my blue plug is covered by a plastic piece that I can't seem to get off. I also notice that some of the picture do not have the plastic piece cover but never really show how to pry it off. Is there screws or tabs I need find? Is the 2014 PC the only one that has this plastic piece? Thank you.