Whenever I try to enter chat it tells me, "You must have 20 reputation on The Stack Exchange Network to talk here". The same thing happens if I go into chat from some other Stack Exchange site.
I tried to look through The Stack Exchange Network and I found my profile on Stack Exchange Chat. If I interpret the information there correctly, I do have less than 20 reputation there. So I think I need to earn reputation there. How do you earn reputation on Stack Exchange Chat?