@beitel tell everyone you know and have them pass along the info to the people they know. I didn't know the person I donated to but knew of her, so it was a directed donation even though she was a stranger to me. Social media has been a great resource. Sometimes it feels more comfortable to let people know through a post as it doesn't put anyone on the spot.
Find out as much as you can about how people can sign up to become a donor so if someone asks, you can immediately direct them to a link, phone # or website. It may reassure people to know that everyone they talk to and all of the donor info and tests are private, even from you.
Let people know they don't have to be young and in perfect shape. I'm 52 and am not at my "goal" anything. Also, they don't have to be a match, I didn't match the person I donated to but she didn't have any antibodies that would reject my kidney. A person can also be "your donor" through chain donation. As long as they follow through with donating a kidney (and you are transplant eligible), you are guaranteed one.
Good luck!