Hide Tags in Oxygen Theme

I recently imported my blog to a self hosted wordpress site.

I would like to hide the gray bars with the tags on the category pages.
I have looked for the tags codes on the different php files and can’t find them.

For example, on this page: http://www.artisbasic.com/category/first-grade

Also, in those preview thumbnail pictures, some of them appear blurry. However, the full sized versions are not blurry. Do you know how to change this?

Thanks in advance!