first place cloth in frame. it should be so tight.cloth should not be loose.
you can see in the first photo, it's the right side of the frame , where you usually paint or embroid.
but now see the last photo, this is the wrong side of the frame or inner side of the frame. this is where you are going to start aari.
place the chair in a comfortable position,[ the chair should not be above your chest level]
place the framed cloth over it, not fully,one half should be extended outside the chair,
at any one corner or edge of the frame place the stone or any heavy weight object.
the purpose is you are going to use both the hands, so can't hold the frame, so in order to hold the frame you are placing this.
ok now you can start aari.
i'll come tommorrow with more picture.