The pagination buttons are not displayed because you don't have enough questions. You only have 14 questions and the default installation paginates in at least 20. You can modify the pagination values from the admin/lists section.
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.