How do I connect a Driving Force GT to Initial D: Street Stage? (Noob Question)

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Before I start, I would like to say I am a bit of a noob when it comes to PPSSPP. I know my way around, but I still need a lot of guidance. Recently, I got Initial D: Street stage, and got it working, with a keyboard. I recently got a Driving Force GT, but I am having problems control mapping it to the game. I found a couple forums, but they were a bit too complicated for my head. Please help me, I would really appreciate it. Thank you for reading.