Hi RBarryYoung,
you can easily remove your blog by logging in as admin or as super user and go to Blog Settings. On the bottom of the page there's a Delete link. Then you can log in as the new desired user and start over with a new blog.
If you just want to change the owner, the only way to do this is using Microsoft SQL Server Management Studio Express (that is free) or logging in as Host, going to Host > SQL and executing this script:
UPDATE {databaseOwner}{objectQualifier}Blog_Blogs
SET 'y'
WHERE UserID = 'x'
Remember to check the Run as script option and substitute x with the old UserID, and y with the new UserID. Let me know if you need further help.
Best regards,
Dario Rossa