This is a detailed, stepbystep guide on how to install SPDstyle cleats in cycling shoes or SPD shoes.
You might be looking for how to install SPD cleats since you bought SPD shoes for cycling or spinning class or for outdoor cycling. This video will help you in both cases.
I like to cycle a lot and the SPD cleats help since you get a lot more out of cycling when you have proper shoes and cleats allowing you to work in both directions (down and up) when using the pedals.
Shimano SPD bike pedals use a 2 bolt pattern.