The object editor has four modes: edit, viewpoint, axis, and point edit. You change the mode you are working in by clicking one of the top four buttons on the toolbar. This will also change the lower part of the toolbar to display buttons appropriate for that mode

Edit mode button. Used for editing objects.  You should refer to the Anim8or manual (Object 1 chapter) for more information about editing objects.

Viewpoint mode allows you to pan, scale, rotate, and size-to-fit any or all of your views of your workspace.

Axis mode lets you move an object's pivot or origin.

Point Edit mode allows you to manipulate individual or groups of points, edges, and faces.  You should refer to the Anim8or manual (Object 2 chapter) for more information about point editing.