PIN authentication requires anyone attempting to login to present not only their username and password, but also their account PIN.
If your computer becomes compromised, this extra layer of security may help to prevent an attacker from gaining access to your account, especially in cases where a keylogger (a device which captures key strokes) is being used.
The PIN authentication form displays the numbers 0-9 and randomly assigns a letter to each number every time you sign in. Your actual PIN number is not recorded, only the associated letter. This is why we ask you to either click the number on the pad or type in the letters that correspond with your PIN number.
You are encouraged to use the account PIN to enhance the security of your account.
Please email our support staff at firstname.lastname@example.org if you are still having trouble configuring or logging in with your PIN.