The steps described in the ickstream wiki are basically:
1- Open LMS in your web browser (http://ipofcomputer:9000)
2- select "Settings", "plugin"
3- copy and paste the ickstream link (from the wiki) in the plugin page and apply (This reboots lms)
4- Then select "Settings, Advanced, ickStream" accept the Terms of use and click on the link to enter an account on the ickStream cloud (open one, or use one of the service providers offered).
5- Add any available service you like to use and your credentials (if you havent logged in the ickStream cloud with the music service account already)
6- Thats it, ickStream is then available in the "My Apps" section.
Instructions available from the wiki:
Open Beta Squeezebox Installation - ickStream Wiki
If you need more help, you can get it on the ickStream forum at:
https://forum.ickstream.com