Right-click the picture. Save it to your harddrive. Use a program like Photoshop or PaintShop Pro to resize it. You can find such a program in the FIle Exchange forum.
After you resize it (Image > Image resize > image size you want), go to
www.imageshack.us or some other uploading site. I think ImageShack has been getting mad at the bandwidth WEForums uses, but ya...