This is a development question not a site administration question. Please post in the developer forum and be more specific about what you are doing, what you expected and what is happening, including example of code you are using to try and access the settings and maybe I can help.
In the mean time I recommend you review the developer documentation, especially the articles about module settings, and the installation system, which allows you to install module settings using the /Setup/Default.aspx page via config files.
Best,
Joe