You should have now:
a java project olat3 [cvs.olat.org]
a Tomcat Server @ localhost-config entry filed under Servers
Optionally: a java project: olatcore
The previous step - configure OLAT - did create a server.xml file, which you will find under olat3/conf/. As a last step you copy this server.xml file to the Servers project into the Tomcat v5.5 Server @ localhost-config. You get asked if you want to overwrite, just do so.
copy olat3/conf/server.xml to Servers/Tomcat v5.5 Server @ localhost-config
in eclipse Window | Show View | Other browse to Server and choose the Servers
right click on Tomcat Server @ localhost-config and choose Run
the view changes away from the Servers view to the Console view and you see a lot of output from the starting OLAT. It also happens that an "Error" message pops up saying "... Server did not start after 45s".. just click ok, this is not a problem.
in the console view you should find something like INFO: Server startup in .... ms
Congratulations you are done!
Point your browser to http://localhost:8080/olat/dmz/