XF 1.5 About home page?

Hi all,
Recently I Installed XENFORO in Google Cloud.
The instances is create by Google Cloud.
The IP Address
Screenshot (15).png
I will go to home page the IP Address is changes to
Actually When the home IP address changes when i installed xenforo in Google Cloud. But i Forgot how to change the when I click the home it will be show in xenforo page not go to old IP Address.
How to solve the problem?