First you need an Admin
Secondly if /attr pos 1000,1000,7 Doesn't work
Try /attr pos 1000 1000 7
/goto 1000, 1000, 7
I don't really know what you mean though..
changing the position of A teleport,
example; a teleport teleports u to 32369,32241,7.
but I want to have that teleport teleports to 23269,31231,4
so whats the command to change that in-game?