To add a new Field right click on the Field container and select Add Field from the popup menu. Alternatively you can select Add Field from the New menu. This will bring up the "Add/Modify Field" dialog shown below.
You must enter a name for every field. You can enter the club that runs the field, any specific location information you would like to include, and any notes you would like to add.
Click "Save" to create the new Field or "Cancel" to abort.