In the TMS Aurelius Export Dialog you have several settings to configure how the export will be performed.
The main option - and the only one you need to specify explicitly - is the output directory. This is where your units will be generated.
For all the other settings, you have a specific tab with several options you can configure:
Finally, in the Preview Tab you have can see all the source code with unit names that will be generated in the output directory. This tab is useful to browse and check the source code before you actually generate it (and eventually replace existing files).