Pleas try the following if you are having trouble with the reCAPTCHA image authentication.

 

Loggin in with a different browser
Image authentication tends to become more difficult if you log in and out repeatedly.
Image authentication might become easier for you if you try to log in with a different browser (e.x. Chrome, Firefox etc.).

 
Logging in using your Google account
You might be able to bypass image authentication if you log in with your Google account.