After you set up the [database replication and configure the Geo nodes][req], use your closest GitLab node as you would a normal standalone GitLab instance.
Pushing directly to a **secondary** node (for both HTTP, SSH including Git LFS) was [introduced](https://about.gitlab.com/releases/2018/09/22/gitlab-11-3-released/) in [GitLab Premium](https://about.gitlab.com/pricing/#self-managed) 11.3.