With the Information Pane open on the right, you should see two tabs at the top: Software Instrument and Master Track. Select Master Track.
The options for the Master Track are all collections of "finalizing" effects that are added to your entire mix rather than any one particular track. They include effects like reverb which, when applied equally to all tracks, can make them gel and sound like they were recorded in the same room, and compression, which can reduce overall dynamic range in order to allow some form of compensation gain (or normalizing) to increase the overall average level of the track... to make it sound louder.
Different finalizing presets are presented in terms of different styles. They're pretty much self-explanatory. For example, in the Rock folder there's "Rock Basic Finalizer," "Rock More Punch," "Rock Bass Boost," etc.
You should audition ones that look appropriate, compare the way they effect your overall track until you find one you like and then leave it selected.
Next time you "share" your file, it should apply those finalizing effects which, along with normalization, should increase the overall loudness of your track.
If it still isn't loud enough, you could go into the details of the finalizing preset and tweak the parameters. That's where knowing about "mastering" comes into a play.
If you are still having problems getting the track loud enough, there are various 3rd party applications, both plugins and standalone, that might be able to help. But maybe you'll get where you want simply by applying a finalizing preset to the master track.
Good luck!