im using Primo PDF too..frequent use it with office tools..for example,if u want to create pdf from word file:

1)open the .doc file using microsoft word
2)select print
3)at the printer name,select primo pdf and click OK
4)a new primo PDF popup will appear
5)select appropriate setting
6)select where the pdf will be created
7)click create PDF

wait a while,then u can see a new PDF file created...