Need help moving objects that I have placed in a world

Hi I was wondering how to move objects that I place in the world cause when I go to world editor and try to move stuff it goes nuts and the map disappears

 

Make sure your snap to grid button is de-selected. Will be the white and black grid button in the
top tool bar.

 

In edit mode (F11) press pause (J) and use the side panel (Scene) to select the item you want to grab/move, dont try to select items from the 3D world because you will often select items behind what you intend to select, always use the scene list to select items. To move an item be sure to select the move tool from the left panel. You can move/ rotate and scale items.