Code for header banner

Hello everyone.

We’re using this theme (Magzimize) on our WordPress based (Espcore). Our theme has an option to edit the header’s banner. You have two options: whether uploading an image and attaching a link to it or pasting a code. The code option won’t work, we don’t know why, so we’re trying to find the way to paste the banner’s code (provided by a betting site) in the editor.

Is there any way to do that? Where should we paste it?

I’m new to www.remarpro.com, so I have no idea how to do it.

Thanks in advance.