map flagging on MacBooks

The MacBook has a one-button mouse. Nothing I try will create a flag on a map. How do mark maps with a MacBook?

P.S. By the way, when I am at http://birdpost.com/faqs and I click on “How do I report a bird sighting onto the map?” it takes me to http://birdpost.com/faqs#11 , where it says “To learn how to report bird sightings to the map, click here”. When I “click here” it takes me to http://birdpost.com/faqs .

Oliver – what do you mean by creating a flag on a map? To mark a new sighting you should be able to double-click. I have a MacBook also so perhaps you can clarify what you mean and I can help you. Thanks – Jason