Customization of Timeslips

About one and a half years ago, I added text to the bottom of our invoices.  I never needed to change it and I don't remember how I didn't.  Every time I go into the bill layout, I cannot find the wording I put at the bottom and no matter what section I hit, the wording still doesn't show up. 

Does anyone know how to get back into the section? I'm very lost.

Thanks.

Michele