FTP credentials for plugin and theme updates/adds?

I'm the Network Admin and when I go into Plugins or Themes to add or update something, it asks me for connection informaiton. I'm guessing this is because my user doesn't have correct permissions on the server. Any ideas on how to fix this securely? I read this

http://www.chrisabernethy.com/why-wordpress-asks-connection-info/

but I'm still having trouble. Here's what I'm seeing:

http://i.imgur.com/YogcNLH.png