I can´t confirm the E-mail

When I try to confirm email, it open a new page with this message

Web email validation is currently unavailable due to high traffic. Please try again later.
Verifying via the code sent to your email on a 3DS or Wii U is still possible

You can confirm your email on a Wii U or 3DS console using the confirmation code that was sent to you

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Where do I enter that code? I mean, PNID (NNID), email, or password?

You don’t put your email confirmation code in when signing in, just put it when you’re prompted to when opening up Miiverse