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If your OS is Windows 10, the user folder is C:\Users\USERNAME\AppData\Roaming. The bolded word USERNAME is whatever user name you chose when you set up your device. In the Roaming folder is a folder named Strive. You need to create a folder named mods in the Strive folder. I created a shortcut on my desktop for the AppData  folder as several applications put saves and configuration files there.

If your OS is different than Windows 10 I can't help you.