My "dedication" is irrelevant, there IS no explanation to be given. You tried and failed because what you said was incorrect, the same as Molitar.
Ok, one more try, and this time I'll crack it. Yeah, probably not, but let's try anyway, just for fun:
This is not my first game/VN and it's probably true for most players. So based on previous experience, I don't expect that I'd have to remember tiny details (keep reading until the end before you react), because it's
almost never the case in other story-based games or VNs. Usually it's that "MC remembers", i.e. some option is presented only after he learns about something. This assumption may of course be wrong, because all games/VNs don't have to be the same.
Now let's take this game. Is there any warning
at the beginning that it should be any different in this regard? No, there isn't. And I'm
not saying that there has to be such warning. But it means that nothing tells me, that my initial assumption wouldn't be correct. So I'm going through the game,
reading everything, but casually, not like a medical report or something, where I need to pay attention to every little detail. And only after
several hours I'm told to write down
one thing (address). Let's mark this moment as
X.
It's only after
X that player can be expected
at all to look for possibly important things to remember. Although since the first one was very clearly presented as something to write down (so there's no way you could miss it, if you read everything), expecting players to look for much less obvious secrets from now on is quite a leap. But ok, it was at least a hint.
Second thing (port) is (I think) in same scene as address and you can't miss it,
if you're playing with sound. Which I and probably most people do, but some don't. I don't remember any hint that sound is mandatory, but it's possible that I missed it. But if there really isn't any, then it's exactly the same thing, a completely unexpected requirement. If there is, I take this part back.
And that's not the worst of it. What about the username and password? Yes, there were some usernames mentioned, but they looked like completely random thing. There was also mention of Sensei's password, which looked like small unimportant funny bit. Unfortunately, I don't remember whether these two things came
before or
after X (and I'm not replaying whole game to find out, as you might do

; if someone knows for sure, feel free to add it). If it was
before X, then there's absolutely no reason why anyone should remember it. If it was
after X, then maybe, but still...
Then what
Sensei's own password has to do with this
<whatever it is> thing, that's whole other matter. Assuming it's not a mistake and it's for story purposes, then ok, but I still think it's asking too much from player to figure out.