First Steps > View Localhost
Your default host for MAMP PRO is localhost. The files for localhost are initially located in the /Applications/MAMP/htdocs folder. Press 
located to the right of the Name text box to open up the localhost in a web browser.
Note: Although the default localhost document root is located in `/Applications/MAMP/htdocs`, it is best to keep it's document root, and the document root of additional hosts out of the `/Applications/MAMP folder`. A better directory structure for your host document root folders would be `~/sites/localhost`, `~/sites/site1`, `~/sites/site2`, etc ... .