Click About on the left side of your Page.; Below General, click Edit next to Category.; Type in up to 3 categories and select an option from the dropdown list that appears;
Click About on the left side of your Page.
Below General, click Edit next to Category.
Type in up to 3 categories and select an option from the dropdown list that appears
Click Save.
There's no limit to the number of times that you can change the category of your Page