I had another class at Apple for our Mac OSX 10.9 and this what I learned...I asked my trainer if i could post her instructions and she said sure.
To Upload Photo on Quiltingboards use Mac
#1. Open iPhoto and find the photo you want to up load
#2. Drag photo onto Desktop
#3. Close iPhoto
#4. Double click on photo on Desktop (should Open in Preview)
#5 Go to Tools -- Adjust Size
#6. You can adjust the 'Pixels" -- it will show you the size of the file below (either MB or KB) --
** Pixels must be smaller than 1.91 MB when you adjust
#7. Close out of photo and it will Save
#8 Go to Quilting Site and Manage Attachments to Upload
#9 Choose the photo from the desktop to upload
You can then trash the photo from the desktop as it is still in your iPhoto at original size
Try this it really works...
Judy in Phx, AZ