Help HP Iphoto cant cahnge default to open images to print

[Fine69]

OK I found this programed for hp printers and it found my printer in a heart beat I originally had it open with gallery and I could manipulate and such the image and send to print but I defaulted to astro and now I cannot do anything or even try to print. how do i change the default back to gallery? I tried deleting and reinstalling but it still default to astro doesn't ask what to open with. also O haven't had any luck with it printing either?