Update gh CLI steps in adding-a-new-ssh-key-to-your-github-account.md

content/authentication/connecting-to-github-with-ssh/adding-a-new-ssh-key-to-your-github-account.md

@@ -135,6 +135,8 @@ After adding a new SSH key to your account on {% ifversion ghae %}{% data variab
 
 {% data reusables.cli.cli-learn-more %}
 
+Before you can use the {% data variables.product.prodname_cli %} to add an SSH key to your account, you must authenticate to the {% data variables.product.prodname_cli %}. For more information, see [`gh auth login`](https://cli.github.com/manual/gh_auth_login) in the {% data variables.product.prodname_cli %} documentation.
+
 To add an SSH key to your GitHub account, use the `ssh-key add` subcommand, specifying your public key.
 
 ```shell