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MAMP is very easy to install. Open up the Finder and navigate to your applications folder. From here, simply drag the MAMP folder you just unzipped into your applications folder.
Now, you will need to launch MAMP. Do so by double clicking the MAMP icon (the elephant). This icon will be located within the MAMP folder. You should now have two MAMP windows opened on your Mac. The first will be the MAMP Apache and My SQL toggle. The second will be a Safari page called "Welcome to MAMP". This second page is where you will control all files being used by MAMP.
From the second window (Welcome to MAMP), click the phpMy Admin tab located on the top toolbar. You should now see two sections, MySQL and phpMyAdmin. Under the MySQL section, type joomla into the Create new database field and click create. You can minimize this window for now.