Select object you like to edit.

Moving with mouse:
Press and hold left mouse button on one of selected object hotspots. Move mouse to move hotspot. Release mouse button to end moving hotspot.

Moving with keyboard:
Click with left mouse button on one of object hotspots to select it. Press arrow keys to move selected hotspot to desired direction. Holding down Shift key at the same time will move hotspot by larger steps.

Double-click on object to activate text edit mode.

Change text.

Press Esc or click somewhere else on the paper to end editing text.