Old documentation can also be found at readthedocs, e.g. for version 2.23.3.
We are using python sphinx for writing the documentation. The source is also completely contained in the git repository at Github.
After consulting the documentation (and only after doing so), you will get the best answers to the remaining specific problems by joining the privacyIDEA Community where users of privacyIDEA get into touch to discuss.
Of course, you might also get into touch with NetKnights GmbH, the company behind privacyIDEA to place your request with the professionals.