Forum:How do i make an image "central"?

Soo....this might be confusing, but I need to make an image "central". FI have an image I use for my signature, but to use it, I have to upload to every wiki I edit on. On other users' signatures, the image address says "central". For example: http://images.wikia.com/central/8/80/picture_name.png. But mine says http://images.wikia.com/wik_name/8/80/picture_name.png. Anyone got answers????

23:29, December 3, 2012 (UTC)