I would like to Edit the Text Box Size, Outer ..........wher

HI

I would like to Edit the Text Box Size/Outer Frame..........where ?

where to find the widht & height to Edit ?

<iframe id="description___Frame" src="fck/editor/fckeditor.html?InstanceName=description&amp;Toolbar=Default" width="70%" height="300" frameborder="0" scrolling="no"></iframe></td>

thank you