To change your preferred currency for payments you make on Facebook:
1. Click on the arrow in the top right corner in the Facebook window and select Settings.
2. Select Payments in the menu on the left, and then select Account Settings.
3. Go to Preferences, and select your preferred currency.
4. Click Save Changes.
If you change your preferred currency, you will have to wait 72 hours before you can change it again.
For more information, please refer to Facebook’s Help Center.