A Q2A theme is just a collection of PHP functions inside a class, so you can output any HTML you want from the PHP code, either directly via ?> HTML <?, or else (preferably) using $this->output() function in the theme class.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, 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.