VLS reads its configuration from the vls.cfg configuration file, which is supposed to be located in the current directory or in SYSCONF_DIR/videolan/vls (where SYSCONF_DIR is /usr/local/etc if you built and installed VLS by hand, or is /etc if you installed the debian binary package) .
To write a vls.cfg file, use the one supplied with VLS as a start-point .