In this guide, you will come to know how to change the region in the Battle net. Go through the guide and follow the simple steps to change it.
You will first need to log out from Battle Net, and a login screen will pop up. Now you have to tap on the world icon on the top right side of that window, as shown in the image given below.
After tapping it, you will see the list of regions; you have to select the region you want to play in and login again. Add your password, tap on the Login button, and play the game in the region you select from the list.