how to get the calculator assistant

Hello, are you perhaps referring to the Form Calculation widget?

I'm seeing you posted another thread https://www.jotform.com/answers/913688 and you mentioned the following on the title:

I have used the calculator field before. But now, when I drag the field to my form I do not get the assistant. Why? I only get what shows on the screen

If what you're trying to add is the Form Calculation widget, don't add the the Calculator widget (that's a different one)

In case we're mistaken, please give us more details on your next reply so we can better assist you.

You are right, in fact I was using before the Form Calculation, but I wasn't aware, thank you so much for your kind answer and clarification

You are welcome. Glad to see that our colleague's answer was helpful. You may refer to the guide below that can help you with performing calculations in the form. 

https://www.jotform.com/help/259-How-to-Perform-Calculation-in-the-Form

Please do not hesitate to get back to us if you need any further assistance. We will be happy to help. 

Thank you for using JotForm!