You posted under Woods indoor plug-in 24-hour mechanical timer.
This particular timer:
Rotate dial until current time lines up with words: 'time now' located on inner dial
To set on-off times, look carefully at dial that rotates.
There are tiny pins that stick up on the dial.
Each pin represents 1/2 hour.
Use fingernail and click pin outward for each half hour you want timer ON
Leave pins inward for each half hour you want timer OFF
Next, plug table lamp into side of timer.
Last step, plug timer into wall outlet.
If this is not your timer, see all Woods timers and manuals:
Or add a comment and I will help.
http://waterheatertimer.org/Woods-timers-and-manuals.html