Configuring WO Mic

I just shifted to Manjaro KDE 2 days ago. I am an absolute beginner to the Linux environment.
I used to use windows before. I do not have a mic and thus used to use this software called ‘WO Mic’ to use my android phone’s mic as a primary mic. I was following the tutorial on this website and got stuck on the last step (loopback device). Since I am a newbie here, I have no idea what a loopback device is and how to use it. Can somebody please help me on this.
Thanks in advance!