how to add your costumize mech?

[kururugikai]

hello everybody.
i just started to use this windom game, and so i want to ask you a question,
if you search it on the google, u can found some mech that already been costumize to download, my queston is, how do you add the mech that you had download so you can play it?
thank you, and sorry for my bad english

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