Hi Jiberish,
To do this, you will need to first switch to the custom home page. This is done through changing the selection found on your home page (if you haven't already done it).
If you have a Hubs widget available, then when the mouse moves over the widget, an edit button will appear on the bottom.
If you don't have a Hubs widget (which means that you don't have a Category Fan list), then you go to the "add a widget" button and you will see a "Hubs (by Category)" widget.
Once you click the edit button, you will see a choice for categories. Select the category that you want and then hit save for the setting to take effect.
I hope that helps.
-Larry