There are plenty of customizable themes out there for you to use. Some are even free! Google "Question2Answer themes".
You can also create your own theme, and the Q2A devs have a great tutorial on getting started:
There are also add-ons, or plug-ins, available which can help customize your site to fit your needs:
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.