URGENT Can I add multiple field to the QR code?

i can see the solution provided here https://www.jotform.com/answers/1125466-Is-it-possible-to-create-QR-code-from-multiple-fields

but i cannot find the Do Calculate field value at all'?

Please advise how i can add multiple fields into QR code

Please check this guide that will help you to conditionally insert a value: https://www.jotform.com/help/268-Conditional-Logic-Inserts-Text-Calculation-Into-A-Field 

On the conditions wizard you will be able to select  the fields that you want to include in the calculation: 

I hope this helps.