Theme X – Editing Backend Text

Hello,

I would like to delete the text “Category Archive Below you’ll find a list of all posts that have been categorized as …” which is displayed under each tab. It’s bulky and unnecessary. This is what it looks like: http://markettrackingfunds.org/category/principles-of-investing/

I use a cPanel and have tried both exploring myself and Googling potential solutions. I’ve failed so far. Does anyone know which file I edit to delete this text? I’m thinking it would be something like category.php

Thank you