I have been using GAEA environmental them for our site and I have been seeing ad link just above the header. How can I remove that?"
This looks like your site was infected with malware. Read this:
https://wordpress.org/support/article/faq-my-site-was-hacked/
Godaddy scan says site is malware free and not blacklisted.
If that “ad” appeared from out of nowhere, then it is almost definitely a malware. Feel free to check out your plugins, try to deactivate them if that changes anything, but this looks like a malware to me.
If you want to scan it, use specialized plugins like this:
Thank you so much, let me have a try.
Yes, do as @LSVRthemes suggested first. If you need any further assistance then please feel free to open a support ticket here: https://support.imithemes.com/help/ticket/new