You can go on the settings and enable "Lauch BDCC with mods", then reopen the game and it'll take you to a screen where you can finde an option to browse mods
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I think what they meant was where to get them. Theres a few mods in the actual game browser and then all the other mods that apparently exist are in some far away land that you have to jump through hoops and go through unecessary stress just to obtain in order to use. They need to be added to the actual in game mod browser.