Do you have oranges blackberry with talk package or blackberry internet solution tariff added to your voice tariff? You will not get email using the device features without this.
Of the 2 tariffs the blackberry with talk is the best.
If you have this your activation may not yet be completed. When it is you will receive an email settings icon and a browser icon.
With wifi only you must browse to your online account or perhaps use a 3rd party application that works over wifi.