This documentation is not using the current rendering mechanism and is probably outdated.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.
If you have any issues, please post about your problems to the TYPO3 English mailing list (typo3.english), so that others may benefit from the answers too. You may also refer to the Tesseract Project web site (http://www.typo3-tesseract.com/).
For bugs or feature requests, please open an entry in the extension's bug tracker on Forge (http://forge.typo3.org/projects/extension-context/issues).