If you are asking how do you change the category your hub is placed in, then no worries. It is easy!
Go into edit mode, once in edit mode look above your title, there you will see your "topic", to the right of your topic you will see the words "click to edit".
Once you click the Click to edit button you will then be able to change the category.
If you are asking something else, sorry the question seems straight forward, but the question is in the wrong category. So if you are asking how to change your category to a question, you can't after 10 minutes.