To do this, you can either:
1) Access your Cpanel and open file manager. Browse to the files (check the path of the URL).
2) Or access the files via FTP.
File to change
Highlighted in line 5 and line 7, change the currency code $ to desired currency code.
Line 7 prints out the currency code.
Below is an example of changing from $ to €
var arr = data.split('€');
$(this).html(""+arr + "€" +arr+ "");
Easy as that. Feel free to ask anything in this thread relating to currency code changes in Bonjour Divi Child Theme.