Is the headline box text and headline box hover already bold by default. I know that you can go into the options and add underline, but I can't seem to add bold. Is that bc it is bold by default? If not, I would like to add it bc it seems that it would be better for SEO purposes?

Have you played with the setting at ATO-> Post /Page Styling->HEADLINE Box: Text

Yes, but, I don't see an option or a way to add bold. I see that you can add underline as a text decoration, which I have done, but I can't figure out how to add bold.

this is where you need to know some CSS add

font-weight: bold;

I read in some post somewhere else that this doesn't work. I tried and tested it, and found that it does not work. The way that I tested it was that I added the bold to the regular text, and not to the hover headline, and there is no difference. If the bold worked, it would be obvious as soon as I ran the cursor over the text. The thread that I read says the header.php is stepping on the font weight property. Here is that link to that thread. http://forum.bytesforall.com/showthread.php?t=2045

It could be that the header.php has already inserted bold as default, but I don't know for sure.