Wikipedia:HotCat
How To Use HotCat change
Enabling HotCat change
You go to my settings and to to the Gadgets section. Click the checkbox for HotCat to enable. You have to have an account to do this.
HotCat usage change
++ (Change Several Categories) change
You click the double plus sign and you edit any category on the page. Click "save" when you are done
- (Remove Category) change
You click the hyphen next to the category you want to remove to remove it.
± (Change Category) change
You might need to use this one to fix category links or spelling
↓ (Change and View Subcategories) change
You might need to use this to modify this from a category to a subcategory of the category you are modifying
↑ (Change and View Parent Categories) change
You might need to use this to modify this from a category to a category the category is in
+ (Add Category) change
You might want to add a new category (existing or not)