[Grace Support]

Hi vishavmitranandgiri

Please write in details what problem you are getting in theme customization.
Please share your website URL so we can check it.

After activating the 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

Please check the documentation to setup and customize the theme

Regards
Grace Themes