Previous and next button

[TiliaLinthout]

Dear all,

I'll pose my question here given that the Slack channel is no longer functioning.
I have been struggling with trying to implement a previous button on the instruction pages of my experiment. I'm familiar with adding a button to move forward to the next screen, but I do not know if there's a way to go back to the previous HTML screen as well?

Thank you in advance.

Kind regards
Tilia