You're on some Codehaus mailing list, but you aren't officially a member. You want to manage those subscriptions. You want to use the just manage email section. Enter your email address, and we'll send a special link to you. By following that link, you will temporarily be authorized to manage subscriptions for your address. No passwords to remember!.
If you want to manage your subscriptions again later, simply follow the same process. Return here, enter your address, check your mail, and then follow the link.
You're a member, you have a set of credentials. Enter them in the user login section and you'll be taken to your My Page for managing your subscriptions.