How to change the top image

Possibly look under Appearance > Header – depends on how the theme is set up. If that’s not it, you’ll need to ask Elegant Themes for help – as commercial themes aren’t supported here.

I’m sorry but as you are using a commercial theme, you need to seek support from the theme’s developer/vendor. We do not support commercial products here.
Try https://www.elegantthemes.com/forum/

I just don’t have the user and pass for that site. My client used another company to do this

Like I said, we really don’t know how a commercial theme is set up, so there’s not much we can suggest.