As soon as you establish it as a default keyboard, you won't have to do it again.
In order to use it as your default tool, and have it appear every time you use any other app, you'll have to activate it using the settings menu or tapping on the Bagan Keyboard icon that appears on your smartphone (once it's installed). In order to install Bagan Keyboard, you simply have to follow a few steps that the app guides you through once you install the app. This tool makes sure that you can type perfectly well in your language, no matter where you are. If you speak Burmese and you're looking for a good keyboard in your language that allows you to communicate directly with your family and friends, then Bagan Keyboard is a good option to have with you.
