[Mad Max]

Ok guys need some help here, I have Amazon Prime, I went to the app via the virgin remote, I cannot seem to get prime to work, I get a message saying sign in to prime on your virgin set-top box, on the left-hand side of the screen there's a pic of a TV with a code, it says enter this code to access prime, but no matter what i try there seems no way to enter the code, any ideas?

Update.........I didn't realise that I had to register my TV on the Amazon website, via my pc, a bit of a carry on tbh...