“I registered the username “BobJones” but it’s not capitalized, it’s showing as “bobjones”. How can I fix this?”

You can’t.

Your login and your URL (ravingatheists.com/blog/bobjones) must be lowercase. You can however change your ‘display name’. In your admin panel go to Users->Your Profile. Edit your first name, last name or nick name and click the “Update Profile” button. After you’ve updated, make a new selection from the “Display name publicly as: ” drop down and click the “Update Profile” button again.

For more information please see the WordPress Codex.