How can i add a custom text in related list?

I'm trying to add static text to a related list in the Deals module. I tried to do this using deluge but it doesn't work.

I did a small test but it didn't work. Basically I want to insert a sales script in text so the salesperson can consult it.

Desculpe, há uma discrepância de etiquetas na função. A lista relacionada não pode ser exibida. = Sorry, there is a label discrepancy in the function. The related list cannot be displayed.

Can you help me?