2. You can open the property page and check it. At this point, you can add it in this property page;
3. If you want to add the attribute field directly to the attribute table, you must first edit the layer and choose to stop editing; Under the editor;
4. Then right-click the small triangle of the first symbol in the property sheet and select the addfield option, so that you can add fields;
5. Then open the addfield dialog box now, fill in the name and type of the field here, and click Save;
6. Now open startediting under the editor, enter a value at will in the window that appears, and then click OK. Complete the field operation.