Hi Alex,
Please verify that your Account Name, User Name & Password are all correct. You can also try substituting your email address for your user name and vice versa. If this doesn’t work try resetting your password from the Method sign in page.
If you try the above and are still unable to sign in to the report designer, please give our support number a call at 1.888.925.6238 x2. I hope this helps.
-Audisho