I have installed the plugin (default theme) and navigated

I have installed the plugin (default theme) and navigated to Network Admin > Settings.

The Theme Settings Area is not available so I can't select the default theme.

I have inspected the source code of the Network Admin > Settings page looking at the sections available in the <h3> tags - these are the listed options:

Registration Settings
New Site Settings
Upload Settings
Menu Settings
Operational Settings

Can you assist please