So, umm this is a really stupid question but how do you find Merana? I know you have to look on the map but how do you know where exactly she is?

when she shows up, there's a huge picture of her, click on it. You really can't miss it.

There is a merana forum post and ping group, thread.

Oh ok, thank you for telling me! I’ll be sure to join the ping group 😃