I have seen people on the internet make songs in swing tempo, but the only tutorial I could find was for FL Studio, which I do not have the money for.
How do i make a song have swing tempo
Audacity is an audio recording and editing program, not a complete software music production environment like FL Studio.
My guess is that the tutorials you have seen are using “MIDI Sequencing”, in which case you could try https://musescore.org or Cakewalk by BandLab.