If you end up on manymorestores.com instead of the advertiser's page via a link in a comparator from vergelijkers.daisycon.com, you probably entered an incorrect media ID. The media ID consists only of numbers (e.g., 12345).
Read here where you can find your media ID.
It could also be that you still need to verify your media. Here is a link to the explanation of how you can do this.