which way to put HERE?
I made the installation at the root https://q2a.com.br
It needs to be the directory where Wordpress is installed. It looks like WP is at the root of your site, in which case where is Q2A installed? If it's in a subfolder then you would need this:
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.