There are several options for the plugin. Here you can choose content types to operate, activate the plugin by obtained a license key, rate the plugin, and view additional information and get support.
Options are located at Left Navigation Bar in Settings -> .DOCS Source.
Chooses how to load styles to render formulas.
To work with Google Drive you need to enter the client API ID, which you need to get through the setup in your Google account.
Also, you can predefine settings by each content type to save time while operating with particular documents. This option is available only in premium mode.