First, the most important thing of all, for you, is to appreciate that "trying to
copy something, some set strategy, that '
just works'," - far from being an appropriate way forward for anyone - is actually one of the five commonest mistakes of aspiring traders and one of the
commonest reasons for "aspiring trader failure syndrome" (there's a little more about that in
this post).
Secondly, the next most helpful thing, at the moment, will be to think about how the MACD actually works, what each of the three figures refers to, how it's constructed, how and why it displays what it displays, and how and why it can/might/will be helpful to you/others. Among other things, if you do that, the reason the histogram doesn't show up when the third number is "1", with some softwares, becomes apparent.
Thirdly, the system you're trying to look at is nonsense, and there are reasons for that.
Fourthly,
this page may help you to understand a little more about the MACD, though some of the sources listed in the post I linked to above will help you far more.
Fifthly, note that the MACD is really terribly easy for the neophyte to misuse atrociously, use without understanding clearly (let's be honest: understanding it isn't trivially easy, as indicators go), and/or try to use it with wildly inappropriate settings for what they're actually trying to use it for (which they can
very easily end up doing, especially if they make the mistake of following widespread forum and/or Youtube "advice"!).
(I'm guessing that you're using MetaTrader? I'm happy to be mistaken about that, and it really
is only a guess; but if you are, it may help you to know that that software platform doesn't display the MACD indicator correctly anyway.)
Lastly, please appreciate that I intend this entire post helpfully rather than critically, and welcome to EliteTrader.