When using the New Form Editor, in order to add a link to a registration field, insert a ‘Text Block Field’
Highlight some text in the Text Block. Click the link button:
In the popup, enter the URL of the page that you would like to link to. Click “Save” to save the URL.
When have finished making all of your edits to the text block, click “Save” to save the text block contents and close this window.