I have just signed up for the 14 free trial.
I want to see what everything will look like on my website, but the site is not finished yet/not published, it's a Wordpress site. Can I just add the temporary URL for the site ? will I be able to see the widgets on it?
Yep, the widgets are fully functional during the trial: https://www.ownerreservations.com/support/articles/widgets
Add those to your site and you're good to go!