1- Click the Field Force button after logging in to FieldPie.
2- Click the Edit Field Force 
button at the left side of the field force.
3- Click the Edit Product Tags button at the right side of the Product Tag area.
4- You can add or delete a tag from the Edit Product Tags pop-up.
5- You can also merge the tags into a title by clicking the MERGE button.
6- You can edit the product tags by clicking the SAVE button.