This support article applies to RSVPify 1.0 and 2.0.
In RSVPify 2.0
1. Navigate to Setup > Custom Questions.
2. Hover over the re-order area of the question you wish to re-locate. Your mouse cursor will change.
3. Drag the question to the desired order.
4. Click save.
In RSVPify 1.0
Your questions will show in the order in which they were created. It's unfortunately not possible to re-order a custom question after it has been created.