The items are not summing up

Hello im trying to create a jotform and im having trouble getting the prices to show up in the paypal i put in the client id and password but its still not working. I attached the link. Thank you 

You need to assign calculation values to your checkboxes or items and then total all of them using the form calculation widget.

Guide:

- How-to-Assign-Calculation-Value

- How-to-Perform-Form-Calculation-Using-a-Widget

You can then pass the total to your PayPal field.

Guide: How-to-Pass-a-Calculation-to-a-Payment-Field