1) In the general options admin, I had to set the new logo URL multiple times before it would show up on the page. What happened instead the first few times was that the base URL was plastered across the header in giant text.
2) Now the "Home" button text shows along with the new logo. I think ti si fine for the logo to be the Home button, but I'd want to avoid the show-through of another home button. Also, the logo is not transparent to the graded bar under it.
3) I know I have to edit the appropriate style.css file, but when I open it, there is no #logo selector, no numeral 247 anywhere, etc.