You selected the female option seeing as you were a girl. After all, this place seems to be an advocate for gender equality.
The machine then gave you a list of creatures for you to choose from including animals, mythical creatures, and their anthro counterparts. You thought to yourself for a while trying to figure out what you want to become, and the options were almost endless.
You then saw a recommended tab and you selected it and a list of the most common transformations appeared on it. Your options were now easier, but it was still a debate, but then you remembered that you needed to remove your clothes, so you did so.
Then you looked at the screen which has an assortment of creatures to become so you chose one. "That creature that you chose will become your new body are you sure?" The machine said, and you confirmed by selecting "yes" and as you did the transformation began taking place.