200 Rep in 30 Seconds
For 150 Rep, go to your profile page, click "Edit Your Profile", and:
Check Subscribe to Official Scirra Blog;
Check Subscribe to Construct 2 New Releases;
Check Subscribe to Promotions from Scirra.
... and don't forget to save!
For an additional 50 Rep, if you haven't already done so, go to the Scirra Blog or Tutorials, and:
Upvote a Comment You Appreciate;
Comment Constructively Yourself.