There is no need to register, just click the "create" button at the top of the page and choose an avatar. You can also customise the avatar appearance if desired, but the most interesting aspect is that if you type any text into the text-to-speech box, and then hit the "play" button, you will hear your sentence as if it were produced by a native speaker of the language you have selected (including French, English, Greek, Indonesian, and Italian). Obviously, the typical prosodic features (intonation patterns, etc.) we use in naturalistic conversations are missing, which is a downside. But for basic pronunciation, it is an excellent tool. Some examples of how Voki can be used for teaching are available in the lesson plans shared by other teachers.