On the tab „Tabs“ you can create, edit and delete single tabs.
You may find further informations regarding the Keytips here.
The respective settings will be made in the Ribbon XML
Tip: The ContextualTabs may only be placed to the end of a tabs listing.
Further informations regarding the Contextualtabs can be found here...
This option is available only if on the tab "Finish" the option "Show Standard Ribbons" is selected. For a ContextualTab this option is not available.