It should go like this:
To set time, press the "clock" button (hold it), followed by setting the "week", "hour" & "minute". Release it to confirm timing.
To program, press the "program" button (I think once should be enough), followed by setting the timings you want. Pressing the "week" button allows you to choose days (mon to sun), "hour" & "minute" buttons to set time. The program sequence should be ON followed by OFF. Also, take note of the channel selection "CH 1-3" button to select the position you want to program. After you're done, leaving it on its own should store the programming. Otherwise, press the "clock" button.
Auto mode should be selected for activation of your program timings. You should be able to test it out at a short timing interval to see if it works.
Disclaimer: I have this set of digital timer, just can't remember the exact details as I haven't been touching it for quite some time. The above should work for you though.