Need ReCAPTCHA removed from Magento admin login page

Recently, I hired a developer to move 2 webistes to a new host, Contabo. The sites are up and running, and almost fully functional. There is one issue, however. There is a subdomain that contains a Magento shopping cart. There is a Google ReCAPTCHA on this page that is not working, it, instead there’s a message “ERROR for site owner: Invalid site key.” This prevents the sign in process from completing successfully, as the ReCAPTCHA box needs to be checked. The sites are hosted in a on a VPS (CentoS 7) running Virtualmin. I’ve logged into Virtualmin, but I am unable to figure out how to disable the reCAPTCHA. The scope of this work is as follows:
- Create a complete backup of the virtual server, so it can be restored if necessary
- Remove the reCAPTCHA from the Magento login page
- Successfully configure the reCAPTCHA on the site (there are a few checkout forms that use the reCAPTCHA, they are not working either).