By double-clicking on a selected object you can invoke the properties dialog for this object and change the objects properties. The chapter on the Draw menu explains the various object properties in detail.
To move an object you can simply drag it with the mouse, that is click within the object, hold the left mouse button down move the object to its destination and release the mouse.
Alternatively you can use the cursor keys to move the object on a pixel-by-pixel (if a grid is enabled then the object will be moved on grid steps) basis.
To size the object move the mouse on one of the choose pads and drag the mouse to the desired size of the object. Some objects only support discrete sizes, in this case the objects size will snap back to the closest allowed dimension.
By right-clicking on the object you will open the Format menu that will allow you to set the style of various attributes on the selected object.