2 Chronicles 34:22
King Josiah sent a bunch of guys to the prophetess to hear from God so they went looking for her and found her and she told them what God had to say (which wasn't good).
She didn't to announce to the world she was a prophetess. She didn't have to take out an ad in the newspaper telling people to come her way if they wanted to hear from God. She just had to be available.
The same is true for us -- we just have to be available.