You don’t need any plugin to get the Contact Form working. FormGet is pretty cool, but it will add another form to your site.
The One Page Theme is setup to use your admin email (This is set on the Dashboard > Settings).
I had issues with my microsoft live account and my Internet Hosting Service. Check that your hosting service is not blocking any ports.
If you’re testing this locally, you need to set your local environment to send/receive email.
Hope that helps.