Add a banner under topmenu2

Hi,
I would like to add a banner under topmenu2, please which file do I need to change?

Thanx a lot for help

Best regards
Joomlis

Hi,
If it is joomla 16/17 or 2.5 please try add new module position. Here you have instructions how add it https://www.gavick.com/documentation/jo ... -position/

Thanks dear Konrad,
It's joomla 2.5 the last WN version, I will try!