How to remove line gap between paragraphs

How do I get rid of the gap between paragraphs? I am running Woo Canvas for my blog, and if I press enter, there is a gap, instead of having it be spaced like when there is no line break. I can’t find any option to change this. (For an example, scroll to the bottom of this post, where it is bold and says “Mrs. Painter’s Pumpkin Pi”)

Thanks