You reply to them and send a application. They will need $ for processing and $$$ for the guaranteed interview.
There are a lot of opportunities in the patch. North Dakota is booming. There is a need for a lot of field workers in LA, east TX and here in Gods Country.
All you have to do is show up, have a lunch bucket, steel toe shoes and be able to pass a pee test. Here in GC these hands start $11 to $13 per no sub, no man camp.