Just in case someone else comes across this needing help... the Couchbase UI is both command line and web-based, the latter of which is typically running on port 8091.

So, for example, if you've installed it on your computer, it would be `http://localhost:8091/`

If Couchbase is installed elsewhere, say IP `192.168.1.101`, it would be `192.168.1.101:8091`

This is covered in the [post-install tasks][1] for Couchbase 3.x.

For Couchbase 4.x, you'll find the docs [here][2].

[![Couchbase 4 Web UI][3]]

  [1]: http://docs.couchbase.com/admin/admin/Install/post-install.html
  [2]: http://docs.couchbase.com/4.0/getting-started/set-up-couchbase.html
  [3]: https://i.sstatic.net/4Gc8W.png