UV mapping, unwrapping and such, yes!
But if you've added texture in Object Editor, to a simple cube you can use the UV tool inside Anim8or?
You need to add texture to all 3 pairs of faces, separately ( Front-Back, Left-Right and Top-Bottom ). So you do it in the Point Editor ( so you work with mesh, not a parametric shape. Convert to mesh if needed) .
-Apply the material with the texture in Object Editor to whole mesh or in Point Editor to all faces. Your left-right, top-bottom sides will be stretched ( the texture ).
-Now, in left or right views, select Left-Right faces and select UV tool ( Enable texture generation... ->yes ). Arc rotate-like widget appears ( yellow color ). Inside the circle , use the right mouse button to slightly move the texture.
-Do the same for the top-bottom faces. In the top-bottom view select faces, then UV tool, but now use LMB inside little squares to properly rotate the texture.
