First find your creation on the Sporepedia and make note of its URL. As an example I will use one of my own creatures.
The URL should look something like this: http://www.spore.com/sporepedia#qry=sast-501071910821
It may have more than this but it will always have at least this
The part after "sast-" is your ID. There are a lot of things you can do with the ID, most, if not all, of which involve the API
Now you can do whatever it is you wanted to do with that ID.
Thanks for reading, and if this was something you needed then I hope it helped!