On the outside edge of the receiver, you will see 2 screws, one on each side. See diagram in figure 3 at the following link.
http://www.eaacorp.com/diagrams-izh27lg.html
When the screw is turned so that the slot is across the receiver, that should be "extractor" mode.
When the screw is turned parallel to the receiver, the should be "ejector" mode.
See also page 12 of the owners manual at the following link.
http://www.eaacorp.com/Manuals/IZH-27-Manual.PDF