Change default storage location to external SD card in Micromax A121 Canvas Elanza 2

Recently I have purchased Micromax A121 Canvas Elanza 2. I have used a 16GB External SD card. I want to change the default storage Internal SD card to External SD Card without installing any apps. I googled and read some blogs. They are saying go to Settings -> Storage -> Change your default storage. But I saw on my mobile there are no options for set default storage.