Advice needed please...

I have just set up my HDD and recording my first programme (neighbours for my wife on Astra28e, channel Fiver). However I am unable to view any other programme other than other programmes on Fiver or Fiver +1. All other channels are greyed out and says "no free tuner!"

I thought I could still view other channels via the 2nd tuner, on the same satellite?

puzzled!