Can I down load a picture on a blank cd on my iMac?

You want to put pictures onto a blank cd? You should be able to.

What version of os are you running? With osx it's really simple.

Go into iphoto, select the pictures you want, and then select burn. You might also be able to just drag the picture onto the disc icon on your desktop.

Using OS X you would insert the CD and drag the photos to the blank CD's icon on the desktop when you have added all the photos you need pull the blank CD's icon to the trash. The icon for the trash will change to a burn CD icon and you will be asked what speed you want to burn at I always select the speed that is selected by default. Your CD will them burn.