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I've clicked on the sign up link sent to my e-mail address, but just get an error message.

In some e-mail clients or on some services such as AOL, the e-mail link sent to you when you start to sign up may be broken between two or more lines. In order to sign up, you must use the full web link sent to you in order to continue the sign up process. If clicking on the link does not work, please cut and paste all of the link into your web browser to continue.