Hi Steven,
Apologies for my confusion, but when you say 'client profiles with Social access', do you mean that they have been assigned a Social license or are you referring to a 'Social User' profile?
To assign a user to a specific profile, go to the 'People' module, identify the user that needs the added permissions, edit the "Profile" selection (can have multiple Profile assignments).
Please let me know if I've misunderstood your request.