The Google+ author profile field

I cannot find the option to enable the google + author field in the settings for google plus found at /wp-admin/options-general.php?page=wdgpo or on the network settings.

Any ideas?

The Google+ author profile field is designed to allow your users to add their Google +1 profile to their profile on your network.

Enabling the + author profile fields allows users to add their Google +1 profile to their profile information in Users > Your Profile under Contact information.