This documentation is not using the current rendering mechanism and is probably outdated.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.
What does it do?¶
The extension allows you to add external links as own backend modules.
There is no need to write any PHP line nor have any knowledge about module registration in TYPO3.
These module records are added as own modules to your TYPO3 installation.