Yes, you can add more co-authors. When completing the abstract submission form, make sure to add the co-authors by clicking on the “+ Add Co-author” button. If the co-author has the same affiliation as the presenting author, you can select it from the drop-down list enable by clicking on the “Add affiliation” button. In case your co-author has another affiliation, please create a new one by accessing the “Create new affiliation” from the drop-down list.