Make sure you have a CRM Form Configuration and a TPC Form Layout attached and configured or else you won't see any fields for the widget. Set up all the field that you want to show in the form. Then drag and drop the rules manager widget to the body of the form. Click on the edit button to configure the widget.
Start by adding a title to the rule. Next, Select the field that you want to trigger the event. Select the event from the drop-down box, then select the action you would like to preform and the field. While you changing the value of the drop down boxed you can see the preview of the rule that you are building. Once you finish building your rule click on the plus button to add the rule to the rules list.
You can add many rules as you like, once you set the rules click on save button to save all your rules.
By default, the rules manager widget detects the current field names (Logical Name) of the widget that are in the form. Typically, the widget field name can be found in its propertied tab and is located under “More Options”.