If you perhaps tried to verify your email address more than once then you might have received more than one verification code. Please use the most recent verification code you received as it replaces all others.
Please check that you are using the verification link exactly as it appears in the verification email.
If you've already verified your email address then you might see this page. You can check whether your address is verified on the settings page.
Do you want to try send another verification email? You can do that from the settings page too.