I think you mean Express Talk.
Anyway, the configuration is fairly simple.
1) Create an extension in Axon and choose a username and password, the display name is just for your own personal reference
2) Open express talk, under the line settings put in the username and password you chose in step 1 and use the IP address of the computer with Axon installed as the Server
3) Optionally give yourself a friendly display name that will be used for caller ID purposes, and simple click ok to apply the settings