Ok I feel like my nib is about to break soon so how do I replace it? By the way I have the full version and I have the Sonar Pen with a replacement nib.

Btw, I got this game in December but I didn't start playing around with it until last month, so my nib had a pretty good run. And I'll be sure to get more nibs with my amazon money from my birthday (November 29th) and Christmas so if my other nib breaks I wont have to disappear for months waiting for more