A "contest page" refers to a specific web page or online platform where a competition or contest is held. It is a place where people can enter the contest, learn the rules, submit their entries, and possibly win prizes. Full definition
Click our official contest page for the details of the winners of the contest. (metroid-database.com)
You can see the official contest page or the official rules for more details. (playstationenthusiast.com)
The blogger would link one of their ingredients to a product the client carried as well as link to the official recipe contest page as a method to declare their entry in the contest. (pointblankseo.com)