If the remote is not now working you will probably need to reset/repair it
if using a BT TV Pro Box
Hi @Hulsepa sorry to hear about this.
As mentioned a re-pairing of the remote control should work at the maint mode screen (press the purple home button + the 7 key for 3-4s until the button flashes) then retry the operation.
A maint mode reset shouldn't be needed for this issue though, so if preferred, just switch the box off for a couple of minutes then reboot and ch 412 / 413 should then be in the guide.
Try either of the above and let me know how you get on. if needed, drop me or one of the mods a message and we'll help where we can.