How Do You Edit The "Build Structure"

i want to edit the Build Stucture Icon.. i went in gameplay interface and changed stuff in there. that doesnt work.. and i look all over the spell editor.. and cant find build structure anywhere. does anyone know where u can find the "build stucture" ability so i can change some things about it?

I think it's automatically enabled for any unit that can build structures. Do you just want to change the icon? That's easily enough done by replacing the original icon with another in the same path.

It is actually much easier than that; simply go get an mpq viewer of some sort (I use WinMPQ) and extract the files Units\CommandStrings.txt and CommandFunc.txt.......... or you could just download the file I attached that has those two files zipped.