Hi Diana
Do you mean the pop ups for the buttons that are a part of the slides templates?
You'll have noticed that in the normal slide view you can't do anything to them which is why I'm guessing you're asking.
Go to the master view of the slide and then single click to select the help button, then right click to open properties. You'll recognise the button to start the content text editor pop up.
The content button is slightly different as it updates as you add or delete pages, unless you have to change this then leave it as it is.
rgds
Nick