You didn't know...?
Have fun then:
You will need to login to the site first off. Try using the exact same username/password that you have for this site (They are part of the same thing) If that doesn't work though, just create an account.
There are a massive number of mods for Armada1 on the site. I've found that some of the mods for Armada2 also work on Armada1, so have a go adding them in. As well, even if they don't say.
Adding stuff to Armada can be a bit of a long-winded process, and can be hell if no help file comes with the mod (Usually does, but not always)
Let me know if you have any problems installing the mod (Sadly, you have to do it manually) or you can just post on the armadafleetcommand.com site for help.
Happy modding.
*Edit - if you simply just want to change the stats of the ships, download the ODF files from the page that I linked to, and put them in your 'addons' folder.
Make sure the files you want to edit have read only NOT checked, and then you can edit them to your heart's content!
For reference, the files that you need to edit are coded with letters. The firat letter means the race, and then the next part specifies the ship, for example:
Bbattle = Borg battleship = Cube
That's how it is worked out.
B = Borg
F = Federation
K = Klingon
R = Romulan
Ships
Const = Construction ship
Freighter = Dilithium Mining Ship
Scout = Scout (Eg. Venture)
Destroy = Destroyer (Eg. Defiant)
Cruise1 = Weak Cruiser (Eg. Akira)
Cruise2 = Strong/Artillery Cruiser (Eg. Steamrunner)
Special = Special Cruiser (Eg. Nebula)
Battle = Battleship (Eg. Sovereign)
NB - Special ships, like the Enterprise-E, Sela's Warbird etc. Are listed as race initial, then the actual name of the ship.
Stations
Mining = Dilithium Mining Station
Base = Starbase
Yard = Shipyard
Yard2 = Advanced Shipyard
Resear = Research Facility
Resear2 = Science Station
Sensor = Sensor Grid
Turret = Weapons Platform (Pulse)
Turret2 = Advanced Weapons Platfrom (Torpedo)
NB - Technologies are labelled like the races, except their initial is a 'G', followed by the (Shortened) name of the technology. (Eg. gamine = antimatter mines)
Hope this helps you*