Log in to Google Developers Console using your Google's account, click on the Create Project button and fill the form to create a project.

New Google Project or Application

Click the newly created project to go to its dashboard.

Click the API sub-menu beneath APIs & auth and the click Google+ API link in Social APIs section.

Google's Social APIs

Click the Enable API button to activate it.

Google's Social APIs

To get the Client ID and Client Secret keys, click the Credentials navigation link beneath APIs & auth,

Click the Create new Client ID button and a popup page will be displayed.
On the popup, click the Configure consent screen

Google's Social APIs

Fill out the consent screen form and save.

Google's Social APIs

At the client ID form, enter your website URL in the Authorized JavaScript origins field and the code below into the Authorized redirect URIs

http://yoursite.com/wp-content/plugins/profilepress/social-login/?hauth.done=Google

Change http://yoursite.com to your website URL.

Google's Social APIs

Click the Create Client ID submit button. You will see the application credentials displayed as shown in the image below.

Google's Social APIs

Copy and paste the Client ID and Client secrete to the appropriate field in Social Login settings page.