After 6 failed log in attempts, that IP address will be blocked for that account until it is verified by the email on the account. The email will look like this.
If you get this email, and did not log in from this device yourself, simply ignore it to leave that device blocked from your account.
If you did generate this from 6 failed log in attempts, then click on Verify Email, or on the link at the bottom of the page.
If neither of those work, copy and paste the link in the email into new browser window.