It means that access is restricted. You may need to log on to see view articles, or you may require special user access.

Instructions can be found under add a picture to an article.

Set configuration value $conf['debug_info'] = 1 in file kb/admin/config.inc.php, then you can see real sql errors and all php errors.
Make sure you properly edited(adjusted) files kb/index.php and kb/admin/config.inc.php

All languages files are in kb/admin/lang/[lang]/ directory. Open your language folder and make all necessary changes.

Search functionality is provided by MySQL full-text searching. This is a natural language search that allows you to type in a question or regular sentence that describes the information you are looking for, and then uses programmed logic to determine the keywords in the sentence. See here for details Boolean Full-Text Searches.

The minimum and maximum lengths of words to be indexed are defined by the ft_min_word_len and ft_max_word_len system variables.
Fine-Tuning MySQL Full-Text Search
MySQL Forums :: Full-Text Search

http://www.your_site.com/kb/ (where kb is an installation folder)

To translate to other language you should copy directory kb/admin/lang/en and rename 'en' to translated language.
Made all necessary changes in .ini files and in config_lang.php
We have made some special utilities, it will display some help information:

• http://your_domain.com/kb/admin/lang/test_language.php
• http://your_domain.com/kb/admin/lang/display_language.php

See template files and css file in directory kb/client/skin/...

For now so called "Search engine friendly URL" works only on Apache web server.
It should work automatically if your Apache installed with mod_rewrite enabled.
Please read here for more details