Product landing page link

How to make the submit button refer to the link given?

What submit button and what link?

In the product landing page project there is a submit button submit the email to newsletter. So when the client submit his email it should be directed to this link to make sure it is submitted.

when you were building the CatPhotoApp in the challenges you went trough that
can you find that lesson on your own?

I actually searched for it but I didn’t find it, Please can you tell me where it is?