MicoTeacher

THANKS!!!!!!!! Like I said, ROOKIES!!!!!!!!!!

It is grayed out.

I am brand new to Chief and while watching a tutorial on one computer and replicating on another, when defining my floor structure, I cannot change it from "lumber" to "I-Joist." I noticed that the video instructor is using X9, and I have X10. Is this a change, or am I just doing something wrong? Thanks! Rookies!