Can't create my Voki

Trying to make a Voki for a class, and I don't have a lot of time. I clicked on Create my Voki and the instructions are over the area where I create the Voki. I don't want to have to install anything as this is a school laptop. I am using Mozilla, which I usually don't have problems with. Very frustrating because I picked this tool to use in an online class, and now I can't use it. I am also not buying a subscritption just to see how I like it.