User drop-down menu > Connectors: You will access the connectors. Click on the button the desired connector section (Google Agenda or Outlook Calendar) and follow the instructions to complete the synchronization with your account.
Once the synchronization is complete, you will be able to access different features, such as a synchronization with your Calendar/Agenda.
Click on the following link to learn more about synchronizing projects with Google Agenda or your Outlook Calendar.