thx for your nice picture, but i really know how to use the interface and the basic functions, but the option i saw in the video was called "extrude face" and did a other thing.
when i try to extrude or move one face of a polygon cube, it only moves in one way... i need it to move/extrude from all sides similiar and to the same time, like in the picture.

hope you understand my problem now :-(
thx Virus