Navigate to Custom Sections and Fields [1] and select “Manage Fields” from the Actions options [2].
Click the ‘ADD NEW FIELD’ button.
Enter the name in the ‘Field Name’ textbox [4], the width of the field in the ‘Column Width’ options [5], the type of field in the ‘Type’ options [6] and click the ‘SAVE FIELD’ button [7] to save changes.