If you want your applicants to provide a url, it would be best to make use of the URL Field to double check that they typed in a valid and proper url. This field also has some nifty bells and whistles when an applicant types in a youtube or vimeo url.
To add a URL Field, click on the Url button on the left side panel of the form builder.
Youtube and Vimeo links
If an applicant types in a Youtube or Vimeo url, OpenWater will generate an in-line preview of that video right there on the form. See it in action.