Can the DPI be changed in my Kodak Z730 camera

Hi everyone,  I want to send 12 pictures to a website that makes custom calendars.   The pics have to be at least 1 meg in size with a DPI of no less than 150 so they can be printed at 12x12".   I have a LOT of pics taken with my Z730 in 5.0 meg size.   I opened some of the pics with Windows Picture and Fax Viewer.   I clicked properties then summary and saw that the picture/s are at 68 DPI.  They ALL are.  Can I change the DPI on the camera to 150 DPI to satisfy the website's requirements?  If not, how can I meet those requirements of 1 meg and 150 DPI?   I called their number and the fellow I talked to said he wasn't a "tech" and I would have to go to Walmart and ask them how to do it.  Thank you for any help.