Aim: Use your mouse or finger (on touch devices) to aim where you want to shoot the bubble.
Shoot: Click the left mouse button or tap the screen to shoot a bubble. The new bubble will replace the one you just shot.
Swap Bubbles: Some versions of Bubble Shooter allow you to swap the current bubble with the next one in the queue. You can do this by right-clicking (on a computer) or tapping the swap button (on mobile devices).
Pause/Menu: Usually, there is a pause or menu button that allows you to access options like restarting the level, quitting the game, or adjusting settings.