How to make it?well, see the instruction bellow:
1. login to your facebook account
2. Then open the "Application Builder" http://apps.facebook.com/applicationbuilder/
3. Open the url bellow to access the "Write in Picture" application
http://apps.facebook.com/applicationbuilder/Setup/New.aspx?ApplicationTypeId=10&StartEdit=1&app=0&ref=apb-tb
4. Then fill the form available.

5. "Click create application"

Note:
click "Browse" to change the picture