Dumb starbase question

Hello all. I'm brand new to the game and still trying to work everthing out. One thing i can't figure at the moment is how to upgrade starbases. I can see the upgrade button but it's always disabled. I've researched various technologies that from their descciption would appear to make starbase modules available, but how do i construct them on a set starbase?

Can anyone help me out?
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Send a constructor over the the starbase. Stabase modules require additional constructors.