I have the 50003 which is nearly the same unit. Anyway, you don't change any settings on this cept plug it in and let it go (and turning the slider on). Here's what is really stupid but it's based on a good idea. This is a set and forget timer that will make a light go on at different times on different days. You Don't have to set anything. Here's the problem. Assuming this one is just like the one I just got (that looks just a little different with colorings), the handout with it tells you the random times during the week it will go on an off. Really, not random, but different on different days. Really, a fantastic idea. So, what's the one night of the week that they program it NOT to turn on the light you put it on? Unbelievably, Saturday. So, the very night of the week that I most want people to think we're home and not away for the weekend, it's dark. That is dumb.
Now, for the Saturday night off thing, you could set it on a different day to trick it to be on Saturday night and off some other. I will reset to use that way. Still do not see why they thought you want it to look like you we're not home on any night while away.