You can earn money from Blogger though these ways :
Advertisement : You can show ads on you blog. Whenever, someone clicks on the ad, you will earn some money. You need to have a Google Adsense approved account for this purpose.
Affiliate : You can review affiliate products on your blog. Whenever, someone buys a product though your affiliate link, you will earn money. Some affiliate networks are - Amazon, Ebay, Commission Junction, Share A Sale etc.
Sponsored Review : If you have a popular blog, then can earn by writing sponsored reviews and posts. You can contact the app/product developer for this purpose.