Icon Association

How do you associate a map or icon with a page? Right now it seems pretty random. I have random icons on that page showing up in the toolbar. I'd like it to be the map. Marc F. (talk) 00:48, 7 May 2013 (EDT)

It's supposed to be whatever the largest single image is on the page. --Riley D. (talk) 16:59, 7 May 2013 (EDT)