The publicly hosted instance of bors-ng is deprecated and will go away soon.
If you want to self-host your own instance, instructions are here.
For more help, visit the forum.
If you want to switch to GitHub's built-in merge queue, visit their help page.
Bors-NG (the Next-Generation implementation of “bors”) is a GitHub App that automates a “common sense” workflow for software development on GitHub: merge a pull request and master together, run the test suite, then push the merged whole up into the master branch. This means that whatever is in master branch has passed the tests, no matter what, even if there are subtle interactions between different pull requests.
This instance is available to anybody with a public GitHub repository. Private repositories will be silently ignored.