Classifieds plugin problem


I have downloaded the Classifieds plugin today, and everything looks good except for one thing. When I go to ‘create an ad’ to test it out, the ‘create a classified ad’ in my classifieds is not visible. If I move the mouse under the main toolbar of the ‘my classified’ page, I see the create an ad button, but it’s black with white writing. That’s why I can see it if the cursor isn’t placed on it (the white writing blends in with white background). Could you please tell me how to change this? Thank you