For a beginner, its hard to find an option to remove "Powered by Blogger" text at the bottom of mobile version of blogger blog .(at first,me too), then gradually after learning the blog's layout and core concepts, i found it is easy as anything to remove whatever we need to remove,
So i came up with this article where you can learn how to remove "Powered By blogger" from mobile versions. Keep reading.
Before you experiment with this, i suggest you to backup your template.