i want to change black color to blue or pink color (http://image.free.in.th/v/20

Hello applepexky,

If you want to change the background-color for your category tag, you have to use a bit of CSS code to do that. Please try the code below and place it in Theme panel->Custom CSS area.

The code is ->

.td-post-category {
background-color: red!important;
}

The result you should see here -> http://screencast.com/t/6T8UTE1y3

Hope this helps!

Thanks.