How to initialize robot's position in RVIZ ?

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I'm using Nav2d simulator where in RVIZ the robot's position is set to X=0 and Y=0 I want to initialize the position to other coordinate for each time when I start the launch file.

I have been looking in tutorial2.rviz file and changed some of parameters but it didn't changed the position. I'm wondering if the robots position is not set in the tutorial2.rviz file then, the program start the position by it self in x=0, y=0.

So my question is where can I find the "parameter name" for x and y position of robot where I can add in tutorial2.rviz file?

I'm appreciating help since it will solve many of my problems.