Thread:Project:Support desk/Editing MediaWiki namespace

Hi, I've just installed MediaWiki using Bitnami and I'd like to start designing my Wiki and customizing it to my liking but atm I can't because I can't edit the MediaWiki namespace. How do I gain this ability? My PC is secure in the sense I'm the only one that uses it and my net connection is private (I'm at home I'm not at a coffee shop or other public place) so I'm confident doing so won't cause me big problems.