You can change the font colors for the forum titles by going into the Category/Forum properties section of the Style Editor. Click the .forumtitle class and then click the Special Link Properties and you can add your font/color settings in the boxes that show up.
For the subject titles, you go into the Forum Summary Properties section, click on the .topicsubject and then click the Special Link Properties and do the same.
But it's not working. It didn't work
I changed it to blue #000088
And the color did not change