To change your Page's category:
1 - Click About below your Page's cover photo;
2 - Click Page Info in the left column;
3 - Hover over the Category section and click Edit;
4 - Select a category from the first dropdown menu, then select a more specific category from the second dropdown menu;
5 - Click Save Changes.
There's no limit to the number of times that you can change the category of your Page.
Note: If you don't see a category that describes your Page, please choose the closest available option from the categories listed.