You can have up to 10 lines of notes stored with your profile (finger). These notes may be used for pretty much anything you want. E.g. you could pose a riddle, or post the standings of a tournament you're running, or just say a little about yourself. (Max 330 characters per note.)
To set your profile go to the menu above in Dasher and click on Action. From the list choose 'Edit Finger Notes'.