You can only find it if you find a space faring empire of human-like creatures that someone created, or you uplift a tribe/civilization/creature planet. Other than that, the only way to find one is to create a save game of human-like creatures. Hope this helps :)
Seriously now, the makers of Spore made it so hard to create a human intentionally. But, if you think a bit (okay, a lot) and have the luck to find exactly the right parts, then it's possible.
You can't find a charmander in Spore, but you can try to make one!
No, I'm a human and we can't do that.
Yes spore mods do work. You can find the largest list of spore mods here: http://sporedum.net/spore-modding/spore-mod-index/
You look for it in your programs and find the application SPORE. It will come up.
at spore.com
Buy it and find out.
in the EA store
in u mum
Look for it on the back of your SPORE instructions manual, it's usually near the top.
You can find it on the underside of a fern.
google spore confirmation code and see if anybody has one to give away.