Starbases and upgrading

I can't find in the manual how to add modules

I keep sending Constructors to my Starbases but cannot get them to do anything other than try to build a new starbase. Is there technology I need to research? Is there a counterintuitive button I need to press?

On a somewhat related note, is there a hardcopy tech tree chart? I did not get one in my box when I bought the game.
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Send your constructor directly to the starbase you want to upgrade (left click on the constructor, right click on the starbase) and when it reaches it, you will get a list of the available modules.

As for a copy of the tech tree, I beleive there is a downloadable version here: http://metaverse.galciv2.com/?g=techtree