Yeah, that's basically it. You have to CTRL-F gensmall and make the changes inside that.
You don't need to search for "row2 span gensmall a", just gensmall is enough to locate the "a" element.
Inside of the brackets, just change the "color" property.
If you don't want to make changes to subblack.css. You can include another css file below the declaration of the subblack.css and insert the a.gensmall yourself. Which will override in real-time only.
Or you could just add <style>a.gensmall { color: #whateverColor }</style> just before </head>