Key

Enter the field name (name of Database field) as mentioned in the database in the "Key" property.  For example : "Name"

Value

Enter the field value in the "Value" field. For example : "Alpha" or [textfied1]. User can set variable in the "Value" field, for example user can use [textfield] to fetch the data from the textfield of the page editor.

Add

Click on Add to add the key-value pair into the data set. User can see the registered key-value pair in the list.

Del

This is to delete the added record. Select the record and then click del, this will delete the selected data.