After creating the dashboard in lightning experience I cannot click on the "Subscribe Option" to select John Wiseman to view the dashboard. I cannot find the share option either, under the down arrow.

Hi All, 

Im trying to do the second challenge in App Customization  but am getting some Super badge am getting the error "Challenge Not yet complete... here's what's wrong:  Couldn’t find the 'Volunteer Shift' relationship field or it is not configured correctly."
Please, anyone, can anyone tell me which relationships should be created between these objects? I have created a master-detail relationship between them. 


Also, am not clear with this "Shifts with cascading delete and the option of roll-up summary fields." 

Thank you and any help is appreciated.
Thank you in advance. 

I am unable to move forward with the Module ''Set up Social Sign-on Unit'' (https://trailhead.salesforce.com/identity/identity_external/identity_external_social) in Trailhead as the challenge is to set up a Google Social Sign-on, however it seems that the Registration Handler provided is for Facebook rather than Google. Is someone able to provide some support /suggestions on this so I can move forward please? 

Registration Handler provided: https://github.com/salesforceidentity/IdentityTrail-Module3 and use Module3RegistrationHandler.cls