To enter the Euro symbol on some computer keyboards, you can hold down the right-hand Alt Gr key, and press the 4 key above the alphabetical keys.
On other keyboards the Euro symbol can be produced as follows:
Turn on the Num Lock function (i.e., press the Num Lock key).
Hold down the ALT key.
Using the numeric keypad, type 0128.
Release the ALT key.
The Euro symbol should appear on the screen.