I was struggling with the tutorials for MAMP on here and on their Forum and just couldn't get anything to work. I discovered this YouTube tutorial that worked perfectly. It is easy to follow and about 8 1/2 mins. If the link doesn't work, just go to Youtube and type in "Installed WordPress on a MAC using MAMP". It is by Creativetoria. There are others (and she has one for MAMP PRO), but this was the best. Worked like a charm.