The air cell is in the fat end of the egg So you want to candle straight down through the fat end.
You might want to give this a read to help you for when you next do more incubating: https://www.backyardchickens.com/articles/the-beginners-guide-to-incubation.73350/
You might want to give this a read to help you for when you next do more incubating: https://www.backyardchickens.com/articles/the-beginners-guide-to-incubation.73350/