help me :(

in front page the 2000 square that allows us to insert backround within a table or a cell, this inactive one, as I can activate it?
in order to give idea of this, please http://mx.geocities.com/xelaxel/propiedadestabla.txt
remitase to the following image I have looked for aid anywhere in the world, please somebody must know like returning to activate the square! thanks thousands to answer my message