If you are referring to the timer with the Dual outputs and twin dials, then this is how to set it:
The digital display shows 1st,2nd,3rd,4th,5th,6th and 7th day. The 1st refers to running the programme every day, 2nd means run the program every other day etc. Press the Frequency button until it displays what you require.
The + and - buttons adjust the clock. If you hold down the button it advances quickly. You have to hold it down to adjust the hour and the am/pm setting. There is no more direct way of setting the hour.
The dials are reasonably self explanatory. I would recommend that you set one side to 6 o'clock settings and the other to the 7 o'clock settings. This will provide higher watering pressure as only 1 side will be on at a time.