From the main menu you can also access this guided tour. In addition, there is a comprehensive DOCUMENTATION section that you should explore whenever you have problems about:

-The web services: data, queries, servers
-Specific explanation about the promoter extraction procedure
-The mapping of the known sites in the promoters
-More about the computational prediction methods used (weight matrices)
-The alignment programs


And if you consider you need more information about the field of promoter characterization, pattern discovery programs and accuracy measures, consult the REFERENCES section: