I'm still not seeing what you're talking about. Those two pages belong to Category:Nordic Countries, but there doesn't appear to be any reference to a "Scandinavian Countries" category. I can't find that being used anywhere on the wiki.
Are you saying that you think that category needs to be removed, or that a new category should be created? Your original message was a little vague. - Sitb(Message wall / Talk page) 08:47, March 17, 2020 (UTC)
Technically any user can, and they do all the time. However, you might want to run it by one of the wiki's administrators first (I'm not an admin for this wiki). - Sitb(Message wall / Talk page) 22:40, March 17, 2020 (UTC)
Yep! You just have to put [[Category:Category Name]] somewhere within the source code of the article you want to categorize. That will add it to the category you specify, and if that category hasn't existed before, it will add that category name to Special:Wantedcategories.
Your new category and the articles within will be view-able as a list, but technically, the category will not completely exist until someone clicks the "Create" button on that category page to write a description of what that category is meant for.