Category at posts must be invisible

Hey all,

I’m making a blog-website, it looks great so far.
There’s just one problem.

Right under the blogs, and right above the comment boxes, there’s a text
saying:

Categorised in: ((category))
This post was written by ((my username))

and this is not pretty at all. Is there a possibility to get rid of this?

I tried checking its css, but it’s just a <p>-tag within <article>,
so I can’t just set article p{display:none;} because the article is common and has other paragraphs on other pages which must be shown.

Thank you!