Go to the abstract module, edit the abstract and go to the 'Authors' page.
Click on change order of Co_ Authors.
Use the 'Change order of Co-Authors' softkey in order to define the sequence of the co-authors from this abstract. The screen below is displayed.
In the screen you can define the sequence of the co-authors by dragging them up or down. When they are in the order that you want, click on ‘Save Order’.