First time? It's simple:

Choose your settings (voice, your language, the other language).
Click (not long press) on the flag representing the language you speak.
Start speaking and press the "Stop" button when you're done. The system will play the translation in the other language.
The recording ends automatically if you exceed the recording time in your package (15/30/60 seconds).
Make sure to speak slowly and clearly in a quiet environment.
Make sure "cookies" are enabled on the device