To resize: From the browse window get your list of pictures - you normally select the one you want to use - click on the picture you want one time - it will turn blue. Then RIGHT click over the blue and you'll have a list of options. Choose "edit", then "resize", then "pixels" change the number in the window to 750, then click ... apply or some such thing to get it to take the number. Save by clicking on the little floppy disk icon. THEN choose your newly resized picture and continue as usual. Now the upload will not fail. One hopes anyway! Good luck!