Federated IDs

Site URL: https://www.greengage.solutions/

I have created a forum with Muut and have managed to embed it into our website in our members area.  I would like the option of a sso so users don't need to sign back in to the members area and than mutt to leave a comment on the forum.  However on Muut it gives me Federated IDs and I cannot see anywhere where this can be inputted. Any further advice would be greatly appreciated.