you get a florish bucket, it will be wider at the top and narrower at the bottom.
you cut the bottom off the florist bucket and then about third way down from the top.
now you should have two rings, the biggest of the rings should be on the outside and the smallest on the inside, this will create a ring in which you put the water, you shouls then hae an inner - circle, this is where you plant your tom and earth it up as the season grows. you should then have something that resembles a grow-pot.
i hope i made that clearer.
thanks
matt