There's no way to add gear to Admiralty ships. All you have are the three stats on the ship (Eng/Tac/Sci) and whatever bonus ability it provides ("+10 Tac per Sci ship", etc.).
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Answers
They're not real ships but more like ship "playing cards" that you send out to do assignments.
Here's some more info:
https://stowiki.net/wiki/Admiralty_System
https://www.youtube.com/watch?v=YfCVxDB6t50