I un unable to sign in to my you tube account by using google crome?

when i click to sign in it shows web page is not available and un trusted certificate|||Try with mozilla or opera.If still unable to access your acc.Chk your user and password.Or reset your password.Just ignore the untrusted certificate.|||Clean your browsing history by using ctrl+shift+delete command an after then you restart your browser .For more information visit us..|||Clear all cookies and try again. If that doesn't work try reconnecting to the internet.And even if that doesn't work try changing ur browser.