Here is how:
1) Click on Create and select New Project.
2) Once a new project is created, you will see a menu in the middle. Click on Record Audio. Make sure your settings are the way you want them and click on Record to start.
3) Another way to record is by clicking on Create, then selecting New Recording.
4) Name your recording and select Audio or Video and click on Enter studio.
5) Ensure your microphone and speakers are connected.
6) Once inside the studio, you can click on Record and start. You don't need to invite guests to record. If you want to record with guests, here is how to do that.