Yes sorry it's MediaHouse, not MediaHome, when installed you should see the Humax as a new 'Device' goto My Contents >> My Video a short tap / click will play the file and a long tap/click will bring up a download option screenI think that was a typo by Erza, the app you want is MediaHouse.
If you are using MediaHouse, the problem may be that you don't have a suitable Media player that can handle the streamed file, try installing MXPlayer, that handles most things
(bearing in mind HiDef playback requires the custom firmware to unlock it first)