If you sign up as a guide there, you can select a specific search term to work. You will be given a week time frame to make a page containing links to that specific search term that will be subject to approval by them (SERP). Once your SERP page approved you will be credited $10 for that page. You can work on as many search term as you want but only one at a time until approved.

Here is the link to register as guide there : http://greenhouse.mahalo.com/Main_Page

For searching using their search engine i think we don't get money.