Put my company logo onto template

Hello,

I’m very new to WordPress. I’m trying to replace the text in the top of my new WordPress site that says PERFECT BIZ to our company logo. Can someone please tell me how to accomplish this?

PERFECT BIZ is at the top of the website right above the site’s tagline which says “Maryland Collection Agency.” I did change the site title to our company name but the image (or text) I can’t figure out what it is as there’s no image that says “PERFECT BIZ” in my media library and it didn’t change.

The site can be viewed at http://www.dukehenry.com

Thanks in advance!