The manual is really not for dilettante.
Press the MENU button
then with the "+" button you scroll through the next submenu until the word "EDIT" appears,
you approve OK and you are in the first program

... which was previously programmed and now you want to change it.
This program will turn on the lighting.
Now with the "+" button you select the days on which the program is to be activated, by pressing the '+' button again, you select the option where all days of the week are highlighted,
you approve OK,
then next parameters, i.e. the hour and minute of switching on as above.
At the end of the settings in editing each program there is the option ON and OFF, with the plus you scroll so that the inscription ON is highlighted, then OK and you go to the second program

... responsible for the exclusion.
The procedure is the same, i.e. days of the week, hours, minutes and finally, instead of ON, you set OFF.
If only one ON / OFF program is needed as you write, then the editing procedure is finished and you exit it by pressing MENU.
It is important that after exiting the menu, the clock icon is visible on the display, because then we can be sure that the automatic mode is on.
I will not give my head, but I did it "on the spot" at the client today and it worked.