From here you'll be asked to choose a name for the file as well as it's location. You can then export this by going to File> Export and selecting the desired format. With these settings, you can then press Record and Play to record your audio which will appear as a waveform once recorded (note that the 3.2 count in is turned off, which prevents the initial count in): To receive input from the microphone, go to an insert channel and select the input as the desired microphone/s: Make sure the output is set to Focusrite (in this case we are using Output 1 and 2).
Now go to the mixer window ( View>Mixer) and click on the master channel. You can change the buffer size on Windows from the ASIO Control Panel, which you can open by clicking ' Show ASIO Panel' You'll also need to set playback tracking to either Hybrid or Mixer. Open FL Studio, open the Options menu, select Audio Settings and s elect the name of your device or the name of the Focusrite Driver if on Windows.