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Can I make a HTML page change things & settings that affect the other HTML page?
Yes, you can. -
Like a user interface?
Sure, why not? -
Does it need PHP?
I wouldn’t say it needs PHP, but it is one way, possibly. There are many ways to do that. -
Is it possible?
Totally!
Anyway, I’m answering your question, even being of low quality, risking to be downvoted, to say that it’s possible to do what you want. But you have to actually search and try something. Then, if you get stuck at any point, you can post a more specific question here on SO, and we will be glad to help!!
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solved Change content of HTML page from another page [closed]