This feature lets you write your own text and make it visible in Glance screen. For example, you can use it to always see your favorite quote or to create a simple shopping list to be available for you while shopping.
Simply select the my text option in Glance Settings > Glance Screen Info drop box menu and write your text. You can change the text in Glance by pressing the settings button to open the My Text app.
You can add the My text tile to the Start screen by using the Pin icon in the lower part of the screen of the My text app. The tile will provide easy access to this application if you want to change your own text frequently.