1. Select Site Explorer > Forms.
  2. Click the pencil icon to edit the form in question.
  3. Expand field elements > Drag and drop a checkbox onto the form.
  4. We can hover over this checkbox > Click the pencil icon to edit > Mark the Require field checkbox > Input instrcutional text for the user such as 'Mark this checkbox to complete the form' > Save.
  5. Under field elements, drag and drop an additional field to appear after the checkbox such as a text field or Email field that we would like required with the form submission.
  6. Hover over the field we would like to require > Click the pencil icon to edit > Mark the Require field checkbox > Save.
  7. Select Manage Rules > Add a new rule.
  8. Set up the rule for If the checkbox is equal to Yes then show the required field added in step 5 > Save.
  9. Click to Save the form.