RAX35 Security Certificate

This morning I used Edge to connect to my RAX35 (yes, that's what shows up in the browser), and received a message that my computer doesn't trust the security certificate.  Is there a way to generate a self signed cert somewhere in the router interface?  I paged through the options in Avanced Setup and found no reference.

By the way, I was able to do this on my NAS from another vendor.

Thanks.