How to record my first mix?

Hello everyone...
Im having a hard time trying to record my first mix track, I really don´t know how to do it... I have a MacBook Pro 13 inch. i5 and the traktor kontrol s4, I try to record what I´ve been play with audacity and garage band but it doesn´t work...
Can anybody Help me here??? Which software to use and how to configure my computer or controller...

Thank you

You can record in Traktor itself

RTM

Really??? how can I do that??? cuase I read the manual but I didnt find anything.

11.7.1
Recording from the Internal Source
Recording from the internal source only works in Internal mixing mode.
In this setup we use TRAKTOR’s Internal Mixer and the Internal recording method. This means TRAKTOR records from the Master Output of its own mixer. You don’t have to do any cabling with this method. In TRAKTOR, do the following:
1.
Open Preferences > Output Routing.
2.
Choose Internal Mixing Mode.
3.
Open Preferences > Mix Recorder.
4.
Choose Internal as Source.
5.
Choose where the recordings should be saved or leave the default settings My Documents/My Music/Traktor (Windows) and User:Music:Traktor (Mac OS X).
6.
Choose a Prefix, e.g. live_jan15th_ - this prefix will be added as part of the filename which also contains a timestamp. Defining a prefix makes it easier to sort and find your recordings afterwards.
7.
Choose a file size at which your recording file will be split. If you want to burn your recordings to CD later, a file size of 650 MB is recommended.
8.
Click on the cassette icon to right corner of the Global section to open the Audio Recorder.
9.
Load a track in a Deck and click Play.
→ You should see the level meters move now.
1.
Adjust the recording level with the Gain knob. It should not clip!
2.
Click the Record button to start the recording!