How to edit html in dashcode via GUI
When you're trying to open your project, make sure you're opening the .dcproj file since this is the actual Dashcode project, rather than the exported HTML project.

Opening the .html file created by Run &amp; Share won't work in Dashcode's actual project editor, and will show the HTML code just as you mentioned. You have to open the Dashcode project file, saved as .dcproj by File → Save.