I don't know if this will help. For the 720ef , this is what you need to do.
There are five buttons on the clock panel and from left to right they are:- Minute Minder, Cook time, Ready Time, Plus
TO SET THE TIME OF DAY
Press the Cook Time
button and the Ready Time
button simultaneously. Use the Plus
buttons to set the time.(24hr clock).
TO SELECT AN ALARM TONE.
Press the Minus
button to listen to the first tone. Release it and press it again to listen to the second tone etc (3 tones)
Releasing the button after the tone has sounded will automatically set that tone.
SETTING THE MINUTE MINDER.
Press the Minuter Minder
button and either the Plus
buttons simultaneously to set the time.
You can cancel the timer at any time by setting it back to 00.00 by using the Minus
After setting, the display will revert to the time of day, but by pressing the Minute Minder
button again, the display will show the remaining time.
If you want all the information, then it is best if you supply a vaild email
address and this will give you access to my BT Digital Vault, where you can have a complete copy of the handbook that I have scanned in.