The form input field is a highly flexible field that can be used to take a variety of inputs, as well as providing validation of input.
Create your form using the Forms for Confluence macro.
Add the Forms - Input Field macro in the body of the Forms for Confluence macro.
Set a Name for the field.
Set a Label for the field, this appears next to the field.
Optional: Give a Description for the field.
Optional: Set a default Value for the field.
Optional: Check the Required checkbox, if you want this as a mandatory field in the form.
Save the macro to see a placeholder box in the order fields will appear on the saved page.
Save the page to see the final field on your form.