indesign cannot find Adobe Pdf printer when saving as postscript file

Hi,

I'm going to print a brochure as a booklet. Therefore I have to save it as a PostScript file.

My problem is: when I go to 'Print Settings' to get the right size on the pages, I cannot find the printer that I have used before 'Adobe PDF'. Instead I have to choose an canon printer, which doesnt give me a A3 size.

How can I fix this??

Cheers