From your WordPress dashboard
- Visit 'Plugins > Add New'
- Search for 'WooCommerce BGN'
- Activate WooCommerce BGN from your Plugins page.
The BGN is now in the list of currencies (at the very bottom) and you can select it.
- Download 'WooCommerce BGN'.
- Unzip the wc-bgn.zip
- Upload the 'wc-bgn' directory to your '/wp-content/plugins/' directory, using your favorite method (ftp, sftp, scp, etc...)
- Activate it from your Plugins page.