Thanks for the compliments!
Sophy Blue was designed for 1.3.6 ZC series, so there are some files on languages that changed a bit.
All the changes are done on the code and not from admin. Only the width setting is done from admin.
The logo file is in the template images folder.
Everything that is within language is in the languages folder
includes/languages/english/sophyblue
Take a copy of the file you want to do the changes to, into your hard disk, and upload the changed file to your template override (the one mentioned above).
That should do the trick. For more detail explanation, visit the Tutorial FAQ link on the top of the page.