x,y coordination _ kind of mess

hii all
i have problem in finding the right address of (x.y.z)
i tried to find the address using the old way with cheat-engine
((float -unknown initial value < increase-decrease>))
but it's hopeless
so i used google to find a way
and there's idea about adding the x offset to basic character address
Basic_character + X offset = x coordination
Basic_character + y offset = y coordination
Basic_character + z offset = z coordination

but now one explain to how to make it work
can any one explain it to me or upload any kind of tutorial
that's will be great
thanks