One of the biggest selling points of Free Software is the large amount of community support provided for it. This support takes the support load off developers and project members allowing them to devote more time to development. If you cannot contribute to the project itself, contributing support to that project helps both its developers and its users.
Many support groups run on the same principles as Free Software projects. The members are often unpaid and undervalued volunteers. They owe you nothing. The best way to get help from a support group is giving help to others when they need it, and doing your own research as much as possible rather than relying on the support group unecessarily. Eric S. Raymond's and Rick Moen's tips on How To Ask Questions The Smart Way might help you frame your questions better.
You can find user groups in many cities and towns, particularly for large projects, or for Free Software in general. These user groups often hold regular meetings, and hold talks or demonstrations related to the project. They often help publicise the project locally, encourage its use in business, and may provide support forums.
Many projects have online user groups, often in the form of a mailing list. These user groups generally provide support, but occasionally also
If there is an existing user group, you can join it. At the least, you can contribute to support forums, or participate in meetings or demonstations. Many users groups are run by individuals or small groups who would appreciate your help. You could also volunteer as a speaker or demonstrator, help with administrative tasks such as mailing list management or meeting organisation or help publicise the group and its events.
If there is no existing user group, consider starting one. Starting a user group requires an investment of time and resources. Advertise first and make sure there is sufficient interest to sustain a group. You might want to contact the developers of the project, who might know of other groups or possible members.
Online support forums are quite similar to online user groups, and the two often coincide. Online support forums exist specifically to answer questions about installing and using a product, or a group of products. Many of the questions and answers are archive for future reference. Every question you answer on an online forum is a question a busy developer doesn't need to answer. Every question you ask on an online forum is a question whose answer will be archived for future use.