Can't Seem to get Plugins to activate on my network

Have set up WPMU Dev plug-in via ftp

and all seems to work, but I can't get/see the plug-ins on my network.

I'm logged into the account my company set up all ok but no sign of the 2 plug-ins I activated in the network or on any of the sites.

What is the best way to activate via the dashboard

Regards
Darron Thevarajah