Cannot log in to web interface after not changing default host

I moved my Gitlab site to a public facing server. I was sent an email asking to confirm my registration; however, I did not change the default host name. I am now getting this in my emails
The SSH still works. How can I fix the host name and recover my user? I am a newbie so assume that I do not know anything other than how to login to Putty. Thanks for your help.
I am on Centos 6 and gitlab-7.8.0_omnibus-1.el6.x86_64