This page explains the Advanced Options, which is meant only for people who know what they are doing.

Kodi/Plex Theater JSON RPC Detection (2.2.5 or later)

When enabled, this option allows MAL Updater OS X detect what Kodi/Plex Theater is playing. To make it function, you must have HTTP JSON RPC enabled. This is enabled by default in Plex Theater, but not in Kodi. You can enable it by following these steps.

Note: Do not enable Basic Auth as it won't work with MAL Updater OS X.

Limitations: The title, season and episode name needs to be shown in the label. This is because MAL Updater OS X will use that information for Anitomy to parse the title, episode and season.

To work, you need to set the following:

• Host: This is usually the IP address. If you running Plex Theater/Kodi on the same computer MAL Updater OS X, you only need to specify localhost. Otherwise, specify the IP address of the remote computer running Kodi/Plex Theater (for Windows, you can get the IP information by typing ipconfig in the commandline)
• Port: The port address that Kodi/Plex Theater is running the API from. For Plex, the default port is 3005 and port 80 for Kodi. For Kodi, you can set it to whatever you have it set on your computer.
• Use File Name Detection - Uses the filename of the playing media instead of the label. This is required if you are using a Plex Agent with your Plex Media Server. However, this option is not compatible with uPnP/DLNA and media files being transcoded.

API Settings (2.4 or earlier)

This allows you to specify a different Atarashii API URL. This is for advanced users only and you should not change these settings.