If you have a photo/image editing program on your pc... open the image in that program/click on edit/scroll down to resize and go from there. Save the reduced image in your "My Documents". I can't remember if I had to save it to photobucket to do the AVATAR. Mine is lousy quality. Don't know what I did wrong there but it came up anyway. Good Luck!
1) Visit: http://www.shrinkpictures.com/
2) Browse for the image and set the Custom max size to 100 and click "resize"
3) Save the resized image to your computer and then follow the steps above.