Most elements can be moved once they are selected by simply clicking and dragging them. Some can also be stretched or rotated. You can access a full menu of edit tools by right-clicking in the drawing area, or by selecting Edit > Modify Elements.
Menus vary depending on the element selected. Typical tools are Properties, Move, Rotate, Duplicate, Replace and Delete. If two types of elements are selected (such as a floor and a wall), only tools that are common to both element types are available.