Categories can be easily managed from WordPress admin panel. Login into WordPress admin panel and go to Posts -> Categories. Here click on desired category name, and you will be able to change category name and/or slug. Save changes when you are done.
I’m really trying to find that, but there’s no Post >> Category in my panel.
I can only see the categories when I go to edit a post… but I cannot edit a category.
In my panel, “Posts” opens only My posts, Drafts and Trash.
Do you know another way?