How to setup form to let 4 respondents to sign

Hi need to get several people (4) to sign a document but I can't work out how to set up the email logic ???

You may try creating a work flow in your form.

Here is a guide:https://www.jotform.com/help/432-a-general-approach-on-building-an-approval-process-workflow

You can hide/show fields depending on the condition.

Guide:https://www.jotform.com/help/196-hide-or-show-multiple-fields-at-once

Please check it out and let us know if you have further questions.