A. Get an access to http://id.fc2.com/, and click "Add Services" for registering this service.
Q. I have added the service, but cannot login.
A. Please try some of the following measures:
1) Check your SSL/TLS settings.
3) Try deleting your cookies and cache.
4) Turn on cookies.
5) Some security software may stop you from logging in. Try turning off such software and try again.