This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
The extension has its own entry in the web menu.
If you don’t like it you can change it in the extension settings and move it to the info module pulldown.
Users can lock the slug to prevent rebuilding.
The locking is only implemented on pages. On other tables an attribute like slug_locked is needed (e.g. on news the attribute path_segment_locked)