Fair warning....I am very new to this.

I downloaded and installed the theme "Grunge Columns." Once it was installed I discovered that there is no ability to edit the words "My Site" and replace it with the name of my website, and this is what I want to do.

Is it even possible to modify this or are the words "My Site" just part of the .jpg?

The block doesn't highlight like the rest when I click 'edit.'

Is there any way for a noob like me to modify this??