How do you activate the wp dev dashboard -- only on the main site

the dashboard plugin -- does not even show up in the plugin selection above

Your dashboard plugin conflicts with so many of my sub-sites -- so I need to install only on my main site -- http://theactionsociety.com. the only options you have is -- to network activate -- if you leave it deactivated

if you go under the main site plugins -- it is not there to activate it individually