Before you start 
For this solution to work, the Career Section must not be
configured for single sign-on (SSO), which usually only affects Internal
Career Sections. If SSO is turned on for a Career Section, then the
property Display the OpenID Option must be disabled or the visitor
will receive error messages.
Here's what to do 
- Click Configuration.
- In the Career Section section, click Administration.
- In the Global Security section, click External Career Sections.
- Click Show next to Default Values.
- Click Edit next to Sign In.
- Next to Display the OpenID option, select Yes.
Display the OpenID Option can be set at the global level and at the career section level for
     external and internal career sections. If the “Allow new users to register in the system”
     Career Section Sign-on property is set to “No”, then it is recommended that the Display the
     OpenID Option for the career section also be disabled. This feature is particularly relevant
     for customers who use Social Sourcing. Candidates who apply for a job through Social Sourcing
     and who do not exist yet in Taleo Enterprise are directed (via a deep link) to the New User
     Registration page directly where they can use the Google authentication. 
- Click Save.
What to do next 
You must also enable OpenID Authentication for a specific
third-party partner if you have not already done this.