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The registration process requires a little back-and-forth between Euphony application, Online Euphony Registration site and your Email.
Here are exact steps with appropriate images attached at the end of article:
In short the flow is this: Euphony web app Registration dialog -> Euphony Registration Site -> Email -> Euphony Registration Site -> Euphony web app Registration dialog.
Please don't confuse voucher code (8-character string which you receive in email after buying a license and which has to be entered into Registration form on Registration site) and registration code (10-character string which has to be entered into Registration dialog in Euphony web app).
Your registration status is always visible at the bottom right in Euphony web application.