Enabling Images on the Wiki

Am I just being thick or is there currently no way to show inline images on the Wiki?

If I try to upload one by going to http://www.rawmaterialsoftware.com/wiki/index.php/Special:Upload it tells me uploads are disabled.
If I link to an external image, it just appears as a link. Does this need to be turned on? I found this on the subject if it helps: http://www.mediawiki.org/wiki/Manual:$wgAllowExternalImages

Sorry, I didn’t realise that was disabled… I’ve enabled the external image flag now, if you want to try again!

Works perfectly now, cheers!