Workbench is enabled by setting the following ApplicationSettings.properties setting and restarting the webapp or Tomcat.
There are two further workbench settings to be aware of:
These control the number of assets that each workbench can contain and the number of concurrent workbenches that can be setup. These are used to control the amount of memory that workbench can use (because assets added to workbenches are stored and edited in memory - the more assets in workbench the more memory is being used).
The attributes that can be edited through workbench needs to be configured via the display attributes admin pages. As an admin user and go to Admin > Attributes > Display Attributes > Workbench. Select the attributes that users should be able to edit and add them to the group. If this step isn't performed then no attributes will be shown when editing assets on the workbench.
Workbench has a few limitations to be aware of, to view these and for further information on the workbench please see this help article.