Instructables API Access Answered

Hello, I am a newbie windows phone app developer,
recently I am working on Instructables reader app for windows phone, I am looking for complex API to get access to user login, comment, post, etc.
Is it possible for me to get access to those services?

here is the link to the app what I'm working on :

http://windowsphone.com/s?appid=875ba3ef-aadc-424c-b087-a281d447645e

Thank you,
Ganesh