i read the documentation of the blend pose,
it say easy to select the target, then select the driver, and then a new window pop put with the channels that you want to reference,
my problem is i want to set 3 poses,

i want to do a leg like the xsi auto rig, where you rotate a null, and the foot roll, and you keep rotating the null and the toes also rotate.

i just set the first step and when i want to rotate the foot bone the windows disappear, and i go to the chop that is been created but i have no idea how to modify or make this windows pop up again to keep making changes .

You should be able to manipulate the handle on screen and then press the new pose button. Once you're out of the tool, you can select the target object again and then invoke the blend pose tool. If the window doesn't pop up, I recall there being a button right on the toolbar above the viewport that let's you open it.

thanks Edward now i get it !!!
here is what i did, for some reason, when i try to “rotate” the bone is when the windows disappear, but now when i select the bone i do get a translate icon at the end of the bone and when i move it it rotates and the windows stays