The code you will need to change will be in style.css of your theme. To track down the specific line code, click your cursor on that element, then if you are in firefox, go into to your web developer section, and use inspector or page source.
Thank you Kannued. I’m going to try that.
I accidentally deleted my question which was:
Hi,
I just intalled bbPress, but there is a new line now on top of the website. It’s like it increased the top margin of the Website. Does anybody know how to fix this? Thank you!