Confirm you've renamed the config file in the inc folder during installation. It's not named config, you have to rename inc/config_adopts.php to inc/config.php - no matter whether you're installing locally or on a hosted server.
If you get more errors after this step, let me know. Keep referring to my
WAMP tutorial, even though you're using MAMP! You may run across a lot of the same errors that need to be fixed in all the same ways - but navigating to where the files you need to edit in MAMP may be different. That's all! ^^;