Hi Rosalie, from memory I think it is > store layout > welcome
the only thing about that space I do not like and ended up moving mine is whenever a viewer uses the Control + or - keys the page - to suit their eyes - the widget moves around or gets partly cut off, looks out of proportion or whatever. So long as no one enlarges or makes the page smaller to view then it looks just fine.
I will go check to see if it's welcome of another spot. I forget now it's been so long..
update > Yes.. that is the spot if you want the widget under your store banner.