The Settings menu is where you will set up the majority of your store. From here you can:
Set up and change your store's options
Set up your tax rates
Add/Remove employees
Set up your labels
Enter your categories
Set up a color system and discount schedule
If this is your first time setting up your store, see the Company Settings section to start setting up your store.
If you exit the Settings menu, you can always pull it back up by clicking on the "Settings" button in the top right corner of your screen from the Back Office. You'll see other buttons along with it, like this...