Method 1: Get consent in the beginning of your flow
If you only need a policy to be displayed once, you can display it as a question in the beginning of your flow and allow responders to continue once they have accepted them.
Style the question as a in your theme menu
Display the document in a modal or link out to your website using the Style menu on the question:
Method 2: Display as a custom question
You can keep a static text header or footer in your flow to display your terms of service throughout every step.
In the Content section of your Theme tab, you'll see the ability to add a static Text component. Click on your top or bottom action bar to add in any additional rows you need to display the component.
When you click on the Text component, a menu of configuration options will display below. You can also use markdown to display the link.