midi edditing plugins placement in program

Question> Have a couple of MIDI editing plug ins that I want to appear with Cubase 7.5’s midi editing like where sx arpegitator appears. I looked around and can’t seem to find where to install or where the vst .dll should be placed with in the program sot that i appears along with cubases midi plugins (not audio). Thanks! Cubase 7.5/PC/64Bit