Reader
noun
The reading someone is someone who is reading. They are the reader (of a book, blog, article, etc).
The reading for 読 is the on'yomi reading, which you didn't learn with the kanji. This reading is どく, and you can remember it by thinking about how you are the reader, and as the reader you choose where to read. For you, the best place to read is a peaceful dock (どく). Sit on the dock and relax. Be the reader.
トーフグの読者が、飛行機代を出してくれたんです。
Tofugu readers paid for my plane tickets.
トーフグには世界中にたくさんの読者がいます。
Tofugu has many readers all over the world.
トーフグの読者のうち、日本語学習者はどのくらいいますか？
Among Tofugu readers, how many are Japanese language learners?