To begin, make sure that your mobile device and the TV you want to mirror onto or the mirroring device (such as a firestick, Roku or TV box) you are using are connected to the same Wi-Fi network. Then, enable the screen mirroring or screen sharing function on your mobile device. This can usually be found in the settings menu under "Display" or "Connections."
Next, on your TV or mirroring device, navigate to the screen mirroring or screen sharing option. This will typically be found in the settings menu or in the input settings. Select your mobile device from the list of available devices to begin mirroring the screen.
Once connected, you can now display the content from your mobile device onto the larger screen. Keep in mind that in order to rotate the screen, you will normally need to physically rotate your mobile device.