To get a link to preview your site, you can either click PUBLISH and "like" and see your i-m.mx domain (in the form of i-m.mx/yourusername/yoursitename, case sensitive). Or, you can click PREVIEW to get the previewing link.
To upgrade, click Publish and choose a subscription. If you need assistance connecting your site, please do not hesitate to contact us. See our tutorial at http://vimeo.com/70846565