The Add button is used with repeatable sections to add a new row. The add button can be placed within or outside of the section it will add rows to.
Demo
Adding an Add Button
To learn how to add, edit, clone, move, resize, offset, or delete an add button, please click here.
Field Settings
To edit the settings for this field type, click the settings icon on the field itself. Click the Save & Close or Save button to save your changes. If you do not want to save your changes, you can click the Cancel button or click any other form element to close the field settings sidebar.