You shouls know that this method is being use for WordPress.com or hosted blogs. Your blog URL is must be in this format blogname.wordpress.com
WordPress is your platform that id being design to manage your blog. So you have no worries on how to change your language because it is very easy to change your language settings if only you can follow the steps below carefully.
First you need to login to your WordPress account using your username and password.
Now Click Settings this is located at your left-hand side, choose your preferred language using the drop-down menu.
Use this format below for instant access
If you will like to change the language interface click Users at the left hand side
Then click Personal Settings on the short list that appears beneath it
Search the “Interface language” option and select your language from the drop-down menu.
Finally you have bow made it easy to switch between interface language options and blog writing language options with out stress.