You can add additional fields to your field selection and attribute values to them to use them for the manual submission to several search services. Please proceed as follows:
In the field Field name the entry New Field is added. Change it to the name which you would like the custom field to have.
Enter the value into Value which you want to belong to the field name.
Click Update to add the Field name and value to the list.
Using the button Delete you can erase items from the list.
Click OK to add all the fields to your list of fields.