Normally they are available instantly, but can be delayed. You have to click on a one of the boost channels to set it up.
Do you have the channels in your channel list?
If not and you have not previously hidden the channels, I suggest you do a retune. If you have hidden the channels you will need to unhide them.
Failing that try a maintenance reset. You will need to restore your personal settings and set up your scheduled recordings again.
Hope this helps, but if not post back and I'll escalate to an OCE for you.