Conditional Formating help

[Mounds]

I am not sure on how to do this but I believe it can be done easily. I have 2 forms a and b. On "a" there is a check box. On "b" I have order numbers in a text box. I would like to make it so that when the check mark is checked on "a" it makes the background for the order number text box to be red or yellow in form "b"
It seems simple enough, but I'm not sure how to do this one.

[RuralGuy]

Perhaps this link will be helpful: http://access.mvps.org/access/forms/frm0031.htm

[Mounds]

Well kinda, I'm not super good with code. But it is 2 forms not a form with a sub form. Should I use one of these to update the other form, then use that form to run the conditional formatting.