This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
The extension is simply installed using the Extension Manager.
When installing for the very first time, the database updates are performed automatically. When re-installing after an uninstall or when updating, the update script needs to be run manually in the Extension Manager.
Note: It is not recommended to change data manually since changes will be lost the next time you run the update script. If you find any data error please report them via email to the extension author.
See the extension static_info_tables.