Adding text or image above or below top menu

I’m fairly new to WordPress and have limited coding ability, but I was wondering how to add an image or text to above or below the top menu of my test site.

The test site can be found at aidibiomedical.com/aiditestsite

I’m using an “Elegant Theme” template and I’m not sure how to add without causing issues to the existing code.

Essentially I’m looking to add a slogan and a the name of our company.

Any help would be greatly appreciated.