If it isn't on the website, please check the `GitHub issues <https://github.com/micahflee/onionshare/issues>`_. It's possible someone else has encountered the same problem and either raised it with the developers, or maybe even posted a solution.
If you are unable to find a solution, or wish to ask a question or suggest a new feature, please `submit an issue <https://github.com/micahflee/onionshare/issues/new>`_. This requires `creating a GitHub account <https://help.github.com/articles/signing-up-for-a-new-github-account/>`_.