make changes to an object that is a mirrored copy

Hello SolidWorks gurus,

I am trying to make changes to an object that I mirrored on a plane. I want to change the angle of one of the exit holes from the original copy of the object but every time I try to edit the feature it sends me to editing the mirroring itself. Is there a way to edit the shape/elements of an object that is only a mirrored copy of the original form? Thanks!

SolidworksParts And Features