Go to The Picture Doctor - Resize, Rotate, or Modifiy the image you want! and follow the directions to resize your pic.
For posting here (not as an avatar) choose the Medium or Large size. ( I chose Lg.)
It’s easy to do… first I went to the FAQ section of forums to see how to add an attachment, then when I did that it told me it was too big, so I went to picture doctor and did it from there.