If you double click on it, it should bring up a box showing your profiles and well as the creature choices. Select the profile and then the creature type.
Just a warning, when using the creature changer, your creature will probably loose some of his learnt knowledge. Do a backup using BWBackup first.
I did that. it said I didn't have a profile. I have 4! I'll try erasing them i don't mind really. i can get to land 3 in a couple of hours. That's hy I'm evil. :devil