how to add PRODUCT GRID to STILETTO theme ?

[rarrvintage]

Hello,

i am building a website with the STILETTO theme and facing some difficulties.

in my menu i have the following categories : exclusive offers, new items, bags. 

i have added a product grid on the new items page and i would like to add one on the product page as well but i'm not able to. The product grid doesn't even appear.

Has anyone ever had this problem ? how can i make the product grid option appear ? 

Thank you in a