I assume you are talking about the Dialogue Wizard, right?
Just create a small hotspot on the screen somewhere (for example in a corner), and set it to go to that next frame.
In the dialogue wizard, go to "Action Tab" of the last dialogue sequence, and choose
"After the answer has been given"
"Do the actions associated with the following hotspot" (choose the correct hotspot number in the drop down list)
Hope that helps
