keeping the go back button displayed

I used the (d-) parameter so that participants are forced to read an instruction set for a set amount of time before they can click the continute button. However, I also want them to have the option of going back to the previous screen.

Right now, when I run the questionnaire, the "go back" button appears right away and then disappears when the continue button appears after my pre-set period of time. How can I make it so that the "go back" button does not disappear and stays for the entire duration that participants are on the screen?