history delete option

I found this information here and set my 2 sons kids computers to not allow
history deletion, this keeps them from trying to Ts& A picture surf.
It keeps my sons from honest online.
I just got my daughters computer redone and now want to do this to hers as
well, I cannot however find the information how to disable the ability to
remove history. If anyone can please share this info I would appreiate it.
Thsi time I will be sure to save it for future use.

Thanks