Go to the site and register as a member, and login. Browse the request lists. If someone else already has submitted the same request, just add that request to your watchlist. You'll be notified whenever a proposal to develop your request is submitted. If there's not already a request submitted, you can enter a new request for a driver for your sound card via the 'Submit Request' form, listing the full functional requirements per the instructions found on there.
Developers can then submit proposals to develop the driver.
It this Authority who serves as arbiter of success or failure for the project. Whichever proposal first gathers enough commitments to cover its bid wins and enters development. The Authority reviews and tests the software prior to release. The above example shows how non-developers can now have Open Source packages written to suit their needs. Plus, no single individual or corporation is stuck with paying the full tab for the development.