You should first check Stack Overflow
and ask your questions there using the
Alternatively, if you have questions regarding the use of doxygen, please have a look at the doxygen users mailing list. If you don't find an answer in the archives, feel free to register and post you question.
If you are looking to contract me (Dimitri van Heesch) to work on a feature or bug fix, then please use the commercial support link. Note that only limited support capacity is available.