I don't know how to upload my Voki to You Tube
Voki characters are not videos - and therefore cannot be directly uploaded to youtube.
However - if you like you can record your character from the screen, using a screen recording utility & generate a video . There are many utilities (some free) available that allow you to do that.
When you have the video file, upload it to youtube.
Hope this helps,
Customer support service by UserEcho