How to build a cube
To build a cube, right-click on the floor and select the menu OBJECT > NEW
Type a name for your new object
Choose the Meshes menu and then click on the Add button to add a first mesh
Select the line "1 1" and then click on the Edit button to edit your mesh
Choose the CUBE mode to create a cube,
then click on the white square and choose an image
from the hard disk of your PC.
Click on the ground of your land: hop a cube appears !
Click on the CLOSE button to save your cube. Bravo, now the other people can see it !
To continue to change your cube, you do not need to repeat all the steps.
Simply click on your cube and choose the menu OBJECT > EDIT MESH.
You are then directly in the last window and you can continue to change it
with many options available ...