Hi Jeanet
Normally the default templates work well, I have installed NB_Store multiple times and evrything worked fine after I followed the steps of the tutorial.
Have a look at the Module-Settings of the NB_Store_ProductList Module
In the Templates section you should see the templates (both handled by the same module)
- for the productlist (ListTemplate/Alternating Template) ... by default this is "productlist.template"
- for the productdetails (Product Detail Template) ... by default this is "productdetail.template"
In the Tabs-Section ensure the "product DEtail Tab" is set to the page where the "Productlist Module" is on
If this settings all are correct and you still see no detail if you click a product in the list then go to backoffice/utilities/templates and find the "productdetail.template" and have a look if there is the default template in there (a lot of html markup and tokens)
If there is nothing in it, maybe your install has failed and is missing the templates ... did you encounter any errors on install?
BTW: What version of DNN and NB-Store do you have? Do you use multiple languages in your portal?
Gerald