Thank you Mike, Abbie and Heather for your replies.
I was asked by the Administrator of the contest that I won if I could resize my winning image to 400 X 400 in order to place it as Avatar for the group. Not thinking anything more of it, I went into PS and cropped and resized..... this is when I tried to upload from my PC to an email, which I now know cannot be done.
I am sure that for an image to be placed as the Avatar for a Group, (my image is pending in the group), this should be able to be used as I figure the system will automatically make it a nice little square just the way we see all images as thumbnails.
If this is correct, I will let the Administrator know. ???