Can't Edit Ceevee fully

I can't edit the text which appears at the starting along with social media buttons, the text starts with heading which says ' I'm Johnathan Deo'
P.S: I can't edit the heading and the tweets which appears at the bottom of the theme.

It's all set in user/config/site.yaml in the Ceevee Skeleton.

A simple text search on the folder revealed it.

Thanks for the help... :-)