I'm trying to join LHC@home. There is an entry in my passwords, but I think it got corrupted. If I click "forgot password", the response is, "No account exists with that email address." If I use the BOINC Manager > Tools > Add Project route and go through all the steps, it says, "login failed, check user name and password." Going to https://sech.me/boinc/Amicable/ produces the same result. I can't post to the message boards without an account, so I'm posting here. How to proceed?

If the project doesn't know your email address, there's no (longer) an account for you there. In that case, just make it anew.