This should be pretty simple I hope.
When I search on the Rig Exchange, there is no search button and more importantly no indication that a search is going on. So I type in the search term, hit <enter> and then nothing happens for a few seconds after which the results show up.
It would be much less confusing if a rotating "wait" type visualization was shown. Also, an actual search button (in addition to <enter>) would be nice.