Every lesson on Codecademy has its own forum entry where you can ask and answer questions about that lesson. At the bottom of the editor for each lesson is a link called Community Forums. Click the Codecademy Forums link to discuss the lesson you're working on.
You can also find helpful hints on most exercises. Look for the "Stuck? Get a Hint!" sign at end of the instructions, on the bottom left your page.
For access to online advisors who can help you with technical questions and give you direction when you gets stuck, sign up for Codecademy Pro.