Hi,
After activating the Amplitude Pro theme, please setup homepage using following
1. Go to Settings -> Reading -> Front page displays
2. Click on radio button of Your latest posts
3. Go to Appearance -> Theme Options and click on Restore Defaults in bottom side
The Site Title is displaying in the upper left corner. You can either use Site Title or Site Logo image
1. To change site name and tagline Go to Settings » General » Site Title
2. To display logo image Go to Appearance » Theme Options » Basic Settings » Logo
Please check the documentation to customize the theme
http://gracethemesdemo.com/documentation/amplitude/
Regards
Grace Themes