I have a classmate who was part of our class but graduated early with the class just ahead of us that also has a cc site.

Should this classmate create a second profile on my class site or is there a way the permit the use of the existing profile on both sites?

message from classmate:
I may have a"problem" because I graduated with the class of 72 and had a login for that. now when I try and use it for our site (73) I can't get in.

In order to log onto your site the classmate must be a member of your site too. If they wanted to keep just a minimal profile on one site they could link to a more detailed one on the other. As an example you can see what I do by going to my profile on the SHS Class of '57 site here: http://www.springfield57vermont.com/class_profile.cfm?member_id=2777657

I forgot to mention that the profile to which you link must be open to the public for this to work.