Illustrator question - colour seperation

Hi This seems to be a problem I am having with a TAFE assessment at the moment. I have saved my illustrator poster to a pdf file and now I have to colour seperate the artwork. I follow similar steps to this and when I get to output mode compositions and seperations hot based come up but not In rip seperations which is the steps I need. I have not a clue what I am doing  and need help. I have obviously done something wrong or its my computer or software, I have all my programs updated so I am clueless right now. I am on an older computer windows 10, illustrator and adobe are up to date any suggestions would be great, I have even reinstalled my printer software to no avail. I did note when I went to output and put in print preset is custom, printer I selected post script file and where it says ppD my printer doesnt show for some reason just  device independant or other when I click on other it goes to the desktop for some reason.