To modify this text to your specifications, copy this file located in the blacklight plugin directory:
<%= Blacklight.root %>/app/views/catalog/_home_text.html.erb
to your top level rails app:
<%= Rails.root %>/app/views/catalog/_home_text.html.erb
Note that you will need to create the 'catalog' directory under views.
<% #Creates a bit space in the page -%>