Menu while ingame

Beginner here,
I followed a youtube tutorial to make a door open and close, and i want to change the menu to a menu which pops up with a inputfield, where the player has to answer a question in order to open it.

when i add an inputfield in the canvas, i cannot select the inputfield. because of the camera.

This is what i have so far, the player collides with a box where the menu will popup.

Can’t figure out what you mean by that.

Also, the bit about where you have to use the input field in order to open the menu that contains the input field sounds like it can’t be right.

thanks for the reply, I am making a escaperoom in unity for a schoolproject. I couldn’t find anything on the internet about it, can you explain to me how to make some sort of a button in a room to make a small menu to show up with a input field. For example, whats 1+1? and if you fill in 2, the door will automatically open. I have coded the door already, but right now it is coded to open at the key press G.