If you perform a factory reset on your Slingbox. (http://support.slingmedia.com/get/KB-1000038)
Then your router will assign it a DHCP address. You will then be able to use any one of the Slingplayer clients to configure your Slingbox.
Web Slingplayer for Safari, Firefox, Internet Explorer (http://watch.slingbox.com/)
Slingplayer Desktop for PC (http://support.slingbox.com/go/windows-download-desktop-us)
Slingplayer Desktop for Mac (http://support.slingbox.com/go/dl-mac-desktop)