If you are having trouble logging into a congregation it could be that the password entered is incorrect. Please check with an elder at the kingdom hall to confirm that you have the latest password.
If you are having trouble logging into the website with your email and password, then it could be that you need to reset your password. Click on the login icon on the top menu and select "Forgot Password". An email should be sent to you allowing you to reset your password. If you don't get the email within a few minutes it could be that your spam filter has moved it to a junk folder or your service provider could be blocking the email. See https://livekingdomhall.freshdesk.com/solution/articles/17000086421-i-am-not-getting-the-email-for-the-count-or-signup-or-password-reset-