You can connect a Google+ Page to CoSchedule using your Buffer account. You must already have the Google+ Page authorized in Buffer before you can connect via CoSchedule.
CoSchedule can connect to Google+ Pages, but not to Google+ Profiles.
1. Add Google+ Page to Buffer.
To connect to Google+ with CoSchedule, you will first need a Buffer account that has the Google+ Page connected to it. Buffer has instructions on how to add Google+ to Buffer.
2. Begin Connecting Google+.
In CoSchedule, go to Settings > Social Profiles. Click on Connect a Social Profile then choose Google+.
3. Authorize CoSchedule to access your Buffer account.
You will see an authorization screen pop up. Click Allow access to accept authorization.
4. Select the correct Google+ Page.
Select the Google+ Page. After selecting, click Connect then click Done.