You need to change the sitemap to show the Dashboard:
- Export and Edit The Site Map
Navigate to Settings>>Customization>>Export customization
Change Default view to Client Extensions View and select Site Map and click on export selected customization
Edit the Site Map
Add Sub area and set the appropriate Url, like following…….
<SubArea Id=”nav_dashboard” Title=”Dashboard” Url=”/../ISV/service/dashboard.aspx” PassParams=”1″/>