thanks for the appreciation :-)
Semantic Turkey runs on Karaf, so you can find all information about the auth to the karaf container on the Karaf user manual.
All configuration files for port, path etc.. also depend on Karaf, and can be found on the /etc folder inside the installation directory. For instance, the port can be set on file: org.ops4j.pax.web through property: org.osgi.service.http.port. Similarly, you can look for other properties.
Notice that you can also adapt the VB client to look for these different settings by configuring the vbconfig.js file, as described here: http://vocbench.uniroma2.it/doc/sys/#further_configuration_for_reaching_semantic_turkey_on_a_different_host_port