how to change the text in a label tag when clicking in different input tags without changing the location of the text

I'm not very clear and I'm sorry about that, when I click on an input a text appears and I would like that when I click on another input, another text appears in the same place. I know it's with javascript but I'm completely stuck.

Is it possible ?

I've been looking for a week but I can't find, I must not be clear enough when searching in google.

Thanks for pointing me in the right direction.