Edit meta description for individual pages

My site is https://www.quobot.com. I am trying to figure out how to edit the meta description of individual pages. I have edited the header and changed the meta description and name there, but for example, I want to be able to change the “John Lennon” pages meta description to “quotes about john lennon, john lennon quotes, etc”. I have tried All In One SEO, but it only allows me to edit posts and the main pages like “Authors” and “Topics”. Is there a way I could edit the code instead of using a plugin? Please help me!