You would need to install q2a on a different web host, then link to it from your blogger.com blog. Please read the installation instructions here:
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.