Thread:Stinger5x5/@comment-22439-20120811192140/@comment-61022-20120811234755

The best resource you can get yourself acquainted with is the help file: http://marvel.wikia.com/Help:Contents

It has all the instructions you'll ever need on updating the Wiki.

As for your question itself, can you be more specific? Are you adding an image to the main page or are you adding an image to the gallery for the character?