We use country settings to help manage Tax.
In your initial Account setup, you were able to select one country for your account. If you operate in more than one country, you can add countries to your account from Country Settings.
Add Operating Country to Account
Account > Settings > Country settings > add
Select country
Select Tax Settings
Add country
Editing Tax Settings
If you need to edit the tax settings of any of your operating countries, you can do this in Tax settings.
Account > Settings > Tax settings.