Isaac, thanks again.
I'll point him at UBBT77.zip and the thread on how to do it.
Sometimes board owners are hard work

I assume he will have to apply your previous recommendation to both styles
1) Go to Control Panel > Styles
2) Find the forum style you'd like to update, and click its name.
3) Navigate to Forum Properties > .forum-input
4) add to the bottom of that list, "font-family:Courier New;"
Click on "Update or Add Style" button at the bottom.