I was just wondering if there was a quick way to add around 500 users to different clubs via the admin side or would I have to log in as each member and then add them individually, just to note that I am also using an SSO. 

There is no way in which to do this within the system at present unfortunately. You would need to get them to add themselves, or as you mentioned, log in as them to do so

ok thank you, i thought that was the case