How can I make a group page that I can add a user from my database using php?

I want to make a school profiling website for our thesis and I want to know how can I make a “add” button that whenever you click it, it will create a page(class) and inside that page there is another “add” button were I can add a user(student) on that page(class).

I already try making the add button were it creates the page(class) and I just did know how can I add the user(student) in it