how to create a new line on form

If I get your question correctly you would like to create a new line in your form. With this question its not very clear if you need to add a line to split elements in your form or you want to add new line in a form element like textbox element.

To add new line in an element this can be achieved by use of html break tags </br>. The other option is in the text element press "Enter" key. Below is a demo on how you can achieve this

To add line break in your form