How to remove distributor rotor from 1989 gmc s15 - 2.5 L
 

May be this is stupid question to some of you but I dont want to break anything so asking if someone can explain via diagram or image or video ...on how to remove existing rotor ...the new one I have is spring loaded...I mean push type ...it does not have screws...I already removed cap but rotor ..am not sure...also existing rotor does not have screws either..

thanks for help...