However I don't want all the data all the time, I want to be able to restrict the search to specific entries, which I think means I have to use rules on particular fields. Following the documentation I should be able to do this in the Fields tab but if I put anything at all in to the small field name box provided I cannot add anything to the rule box. My Fields box looks different to the one on the documentation provided which shows a much larger box - I attach a screenshot from my template.
Have I missed something somewhere?