Plugin and themes update on Multisite wordpress install

I have problem to update your plugins and themes installed on my staging website. Site is staging http://missionwebs.staging.wpengine.com ( live site is missionwebs.org ) - I want to update everything on staging website so I can see if websites work ok afterthat we well move to live website, as we have about 30 websites on that network. I just cant find button to select and update only yours themes and plugins. Can you help me with that please?

Thanks