How to set and test load balance?

I set up a JupyterHub on google Kubernets. Now I want to set and test load balance. I found some instructions on the website below, but I still don’t know how to configure it on the Google cloud platform. Can anyone help me out? Thanks!
https://zero-to-jupyterhub.readthedocs.io/en/latest/security.html?highlight=load%20balance