Welcome!
To modify this text to your specifications, copy this file located in the blacklight plugin directory:
/usr/local/rvm/gems/ruby-1.9.3-p0@blacklight/bundler/gems/blacklight-dc46192d9b2e/app/views/catalog/_home_text.html.erb
to your top level rails app:
/gluck-mounts/var-www/html/blacklight_demo/app/views/catalog/_home_text.html.erb