As an organiser, you can fully edit abstracts. That means you can
edit title and text
adjust the author list (presenter, position, institutes)
change the preferred contribution type and topic
finally submit a created abstract
To recognize which abstracts have not been completed or have not yet been finally submitted, see: Identifying an abstract's submission status
Step 1: Select the abstract you want to edit
Depending on the status of an abstract, you can search for the abstract you are looking for in different menus:
1. in the User menu, all abstracts can be edited, regardless of the submission status.
2. in the Abstracts & Reviews menu, only submitted abstracts can be edited, regardless of the review status
3. in the Program Planning menu, only accepted abstracts can be edited, regardless of planning status.
Step 2: Edit the abstract
Open the abstract form of the abstract you are searching for to edit it, e. g. make changes on the author list.
In the edit view, the "Content" tab is preset.
Make the planned changes and click on the button
Save" to save the changes. After that you can make further changes.
Save & Continue" to save the changes and move on to the "Preview" tab.
See also the help articles on abstract submission for submitters: