1) Have a 2k community account registered and linked to your PS3 or Xbox Gamer tag
2) Have uploaded a box score from your NHL 2K Franchise
If you've done this, to turn on the feature follow these steps
1) Goto the 2k community home http://community.2ksports.com/community/
2) Login with your 2K account
3) Hover over your avatar, click on "Edit My Account"
4) In the blue bar , click "blog options"
5) Turn on the image and hit update. Once you do and the page reloads, you will see a text box with some bbc code. Copy that code and paste it as your signature on which ever forum site you want.