How do I activate ekey control unit extension modules?

1. Disconnect the ekey bionyx system from the power supply.
2. Remove the EXTENSION LINK from the back of the control unit extension module.
3. Plug the EXTENSION LINK into the left-hand side of the control unit extension module.
4. Push the ekey control unit DRM and the control unit extension module together.
5. Reconnect to the power supply.

You can now configure the relays:
How can I assign a function to a relay?