I need to show DWQA categories

Hi,
At the moment, the DW Q&A free does not support to display the categories in the sidebar. You can go to the demo, it’s the pro version of the DW Q&A, you can refer here: https://codecanyon.net/item/dw-question-answer-pro-wordpress-plugin/15057949

In the pro version you can use the dwqa categories/tag widget to display categories or tag.
Regards,
Dominic from DesignWall team.