If you made a mistake entering your password, so your account became locked, you can reset it yourself. Click the Forgotten your login/password? link on the login page and follow the instructions. This will unlock your account.
If you leave an organization, the Organization Administrator should lock and disable your account. You’ll need to ask the Organization Administrator at your new organization to create a new account for you.
If your account has been locked and disabled in error, ask your Organization Administrator to grant you access.