how do i set up totlas widget

If you are trying to perform calculations in your form, you would first need to assign calculation values to your options:

http://www.jotform.com/help/301-How-to-Assign-Calculation-Value

Then, you can total up the values in a calculation field:

http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form

If there is something else you are looking for, let us know and we will be happy to help.