Term Store Manager is a feature of Essentials for Office 365 Architect. It delivers full control of SharePoint term stores from the convenience of a client interface. Users can granularly or in bulk create, edit, delete, copy and merge Term Groups, Term Sets, and Terms. Term Sets Manager also allows users to export the Term Sets into a CSV file. This CSV file can then be used to duplicate Managed Metadata in other SharePoint applications.
To access a site's Term Store, right click on a site and select Objects > Show Term Store or select the site go to the Term Store Manager tab and click on "Manage"
- Expand the term store hierarchy to view Term Groups, Term Sets, and Terms.
- Once an item is highlighted, the right click menu will display the available options.
For detailed information please refer to the documentation.