adding text to homepage

using gridmarket for my marketpress site, the theme itself it shows

Footer one

Footer two

Footer three

Footer four

Footer five

Sidebar

for widgets to be placed, this is fine to some degree, but i cannot figure out how to add text to the homepage. Not mydomain.com/shop/ but mydomain.com which shows all products from all shops setup in the grid.

I want to add both text above that grid and a slideshow below that

as an example i found this site in the forum using gridmarket theme
http://fondelifair.com/

if you scroll down the page it shows:
more >>
From the Blog

which rotates posts

then below that shows newest products.

on my site i want something similar, but above the grid i also need it to show text