You should be able to see the Google jobs option at the end of the 'About the Job' section when you post your job:
If you do not see this, this means you have the Adblock Chrome extension. You will need to remove this in order to select the option to advertise your role on Google jobs via Visage.
If you still have issues, please reach out directly to us and we can further investigate for you.
You may also be interested on this article: http://help.visage.jobs/clients/client-support/how-do-i-get-my-job-posted-on-google-jobs