The table and the tool buttons in the upper right allow you to add, remove and edit journal entries. For each entry you must provide the full journal name, and the default abbreviation (e.g. "Aquacultural Engineering" and "Aquacult. Eng."). The last field, which contains the shortest unique abbreviation, is optional. Therefore, you can actually safely omit it. To edit an entry, double-click its row in the table.