Are you accessing the following URL, which you will need to adapt a bit: (yourdomainname) /wp-admin/admin.php?page=tvr-microthemer.php
You can get to this page from the WP admin area, by clicking the ‘Microthemer’ link in the left menu. Or by clicking the ‘Microthemer’ link that appears in the top toolbar on the frontend.
Also, to begin with you will just see the responsive tabs. The style editing options only appear once you have created your first selector (double-click something you want to restyle, optionally adjust your targeting, and then click the create selector button). You may find the getting started video helpful in demonstrating how to create selectors: https://www.youtube.com/watch?v=if1G_SQt43s
If you’re still not able to see your site and the top editing toolbar, please send me login details for your site via this secure contact form and I will investigate the issue.