Available to use

Hello,

Im trying to create a quiz system that allows users to log in and take
a quiz. However there are two users of the system, lecturers and
students. What I need help with is I want to make a page on my slide
to allow a lecturer to make content avaiable. For instance

If the lecturer logs in they are taken to a page with two buttons on
it saying log out or make slides avaiable.

Then if a student logs in, depending if the presentation is avaiable
they are taken to the quiz, if it is not avaiable a message pops up
and telling them it is unvaiable and they are taken to the login
screen.

Im thinking that i need some sort of button to update a textbox with a
value and if that textbox has the value in then it can be made
available but im ensure on how to do this?

Can anybody help with this? sorry the above is a bit confusing.

Thanks

Nick