In the Web Content section, click the Font Size drop-down menu. You can choose between multiple sizes of text ranging from Very Small to Very Large, and the changes will take effect immediately.

That six-digit number is what determines the header font's color, so changing the number will alter the display. This article's resource section includes a link to common HTML color codes.

Press "Ctrl-F" to open the Find tool and then enter "font-family" (without the quotations) into the field next to Find. Click "OK" to search for the text in the HTML code.