Choosing one option to make more options available

Hello sir.. i was Using jotform but i am not understand it.. we have add a article in this site who will

Thank you for contacting us. I also recommend creating an account first.

You can sign up using your email account on this link https://www.jotform.com/signup

As to your inquiry, I think what you are looking for is the Condition Logic feature of the form.

User guide: Smart Forms Using Conditional Logic

Let us know if you need further assistance.