It seems that none of the plugins/addons used in that blog post are supported by us. With Developer Edition($) and above you can do PR decoration on your Bitbucket Server PRs. The documentation for that is here.
Which settings are you looking for in Bitbucket Server that you aren’t finding?
SonarQube uses a Bitbucket Server user account to decorate your pull requests in Bitbucket Server. So you a Personal Access Token from that account with with Write permission for the repositories that will be analyzed.
Then you need to set your global and project settings in SonarQube according to the docs Ann linked.
Sorry for the miscommunication. While the readme for that plugin does mention Bitbucket Server support, it appears Bitbucket Server is not actually supported as noted here.