This forum is only for discussing the Generations family history program, not Family Tree Maker or PAF. Your question is therefore off topic.
I will give you some guidance anyway.
First of all why do you wish to move from Family Tree Maker v10 to PAF? That would be a backwards step. Family Tree Maker v10 should work fine. How many people do you have in there?
To answer your question, go to the Family Tree Maker File menu, Copy/Export Family File, cilck the Save As Type box, select GEDCOM (*.GED), click Save. Then import the GEDCOM file that you have just created into PAF.