I've been trying to do this all day, I go through the first 8 steps & when I hit submit, I get a blank screen

I've tried it in 2 different browsers, same thing.
Any ideas?
Also, even if I were to get through that, I'm not seeing where this is:
9: On the left, click Templates under Style Components
10: Click Edit next to Prosilver.
11: In the drop down menu, go to the very bottom and select viewtopic_body.html and it should open an editor with the current code inside it.
I don't have an 'edit' in Templates

only a 'details' & when I go there, there's no drop down menu
thanks in advance