How did you manage that, try going to apps and look for file manager hd and then go to APKs and look for xbmc you can install it from here if you have lost it or accidentally uninstalled it.
Then re-run the wizard (when you go into xbmc) and remember to click ok on the last message and then unplug the power cord from the back. Wait then back in and back to xbmc and wait around 20mins for it to update the add-ons.
If you hav'nt lost xbmc and its only the icon try and add a short cut I, I'm not sure how you do it on this box, but look for a plus sign and click on that.
Hope you sort it out and good luck.