Are you asking how to navigate onto different pages of your WordPress site from within the Microthemer interface? If so, you can single-click any link on your site to follow it (even though the cursor is a crosshair instead of the regular finger icon when you hover over link).
I’m glad you’re enjoying Microthemer. You can manually tell Microthemer which page to load by specifying it on the Preferences page. You can access the Preferences using the toolbar on the left (which may need expanding).
I’m here if you have any further questions.