Difficult to say when you are Anonymous, I can't check your posting history, but I think you are seeing 'Suggested Answers' that Fixya thinks might be useful to you. This happens all the time.
Anyway, your Noma Timer is made by Woods. It does on have one button purely because it is a photoelectric timer. It comes on when it get dark, so it needs no On or Start button. Your single button sets the number of hours the power stays on.
So, if it gets dark at 5:00 pm, and you want the lights to go off at 11:00 pm, you press the button 6 times until you see '6' in the display. That's it. it will turn on at 5:00 and turn off 6 hours later at 11:00 pm.
You CAN'T set it to come on at 4:00. It will only come on when it gets to a certain light intensity at dusk. For that, you need the two button version, which has Mode and Hours. .
Here is the manual. If you look carefully, the instructions are usually embossed into the back of the timer. Make sure the photocell is facing outwards and is not covered by greenery.
http://waterheatertimer.org/pdf/Woods-49103-N1502-manual.pdf
https://www.google.com/search?q=Noma+N1502+timer
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