The waiting list for kidney transplants in America is over 100,000 (and growing at a rate of about 10,000 a year). Seventeen people a day die while waiting for a kidney transplant. (Note: Statistics in countries like Australia and England, where non-directed organ donations are still rare, are even worse.) And yet all it takes to save one of these lives is for someone to volunteer to donate a kidney.
Many hospitals in America will find the most deserving recipient for a non-directed (aka altruistic, Good Samaritan, or anonymous) kidney donor, i.e. someone who just wants to help a person suffering from kidney disease, whether they know the person or not. You just contact the hospital and say that you would like to donate a kidney to help someone on the transplant waiting list.