How to chang the two motor's speed for skid steer

hello, I want to build a boat with two motor,without steering rudder,change the two motor’s speed for skid steer,how to set the ardupilot?
thank you!

@Vincent,
Start here then go to here.
Then we will help you resolve any issues that you cannot resolve yourself.
Regards,
TCIII AVD

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Thank you so much!:thumbsup: