@AddyCO7 (18 September, 2016, 3:06 PM UTC):
Near the bottom right of your screen, there should something that looks like this ( http://i.imgur.com/6IjOV3F.png ) .

Click on the yellow circle, then all your buildings should be blue with a darker shade of blue for an outline.

Click on a building, and a menu should come up for what you want to do (Only some buildings can be removed; all of them can be moved and rotated).

When you move a building, the blue should turn green if you ca place it there; Red if you can't.

Alternatively, you can expand your sector.

I can move and rotate the buildings now, but I have 5 Titanium and 5 Uranium mines, 3 Banks, 3 Warehouses, 2 Vaults. And Cannot see destroy in the button of these items. How can I remove/destroy some of them?