After my post last night, I noticed that a ton of traffic came in via search engine traffic from folks looking for help with the Codeacademy exercise.
If you are stuck at step one, read their directions again...carefully. In the first step all they want you to do, is return all the numbers from 1-20 using a "for" loop. Nothing more.
So, this will get you started:
This should get you started.
Hope this helps!