On a Macbook, GarageBand can do more with the Focusrite 2i2 than Audacity can. 

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Next, you choose how GarageBand handles the audio input it gets from the 2i2.  Using the Input dropdown menu on the Choose a track type screen, choose whether you wish Garageband to record a single speaker or both speakers in the first track.  The simplest configuration is to choose a single stereo track for both inputs, by clicking Input 1+2.  This means one microphone will be heard in the lefthand speaker, the other microphone will be heard in the righthand speaker.  This may be suitable for many projects.

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One Microphone Per Track

In GarageBand, you can have each microphone on its own track through the 2i2.  This requires several more steps, but may be worth it if you prefer both microphones to be heard in both speakers, or you would like to subsequently adjust the volume on each microphone within GarageBand.

Start the project by creating a track, but choose only 1 input
Once that track is created, click the + button above that track to create another track.  You'll again see the Choose a track type screen. You need not specify the 2i2 again. But this time, using the Input dropdown, choose Input 2 for this track.
Now you have two tracks, each drawing from one of the microphones. But you need to tell GarageBand to record them both simultaneously.  Right-click (or Control-Click) on either track, and choose Configure Track Header....  On the following dialog screen, check the box next to Record Enable.
Then, click the little Record icon within either track's control box.   When you click the master Record button up top, it will capture both tracks.

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