My husband helped me figure it out for the Mac.
If you are on a Mac and have your photos in iphoto, on the top bar in the file section there is an export button (press it), you will then be able to resize it (medium seems to be OK). Press export. You will then be able to decide what file to put the picture in (I made a new file called RSC). Hope this helps. It helped me to write it out. I know I will forget and need to check my directions.