Using a mouse on a gamecube game on dolphin 2.0

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I have dolphin 2.0 version and im playing zelda twilight princess(gamecube) its hard to fish using the keyboard, so i want to use the Cpad as the mouse...is this possible and can anyone tell me the configuring to enable the mouse on dolphin 2.0

Ps. Im not asking for how to do it on Wii remote and im not buying any wireless controls to connect as they are hard to find