Hi Karin,

It looks like you disable it in theme options (WordPress Customizer).
Within your dashboard navigate to Appearance > Customize > Post Settings and toggle "Show Category Link" (2nd option from the top).

Let me know if you have any questions at all.

Cheers!
Lazar

We added a 'Post-list' to the home page. And selected the option to show the category of a post. But nothing appears. 

www.uxinsightnotes.com

Thanks,

Karin