Adventure Journal, CMS question

Hi,

I am new to WP and working on a site using Adventure Journal.
The site’s not yet live but I am having problems….

Another user will need to be able to log in and add photos and a small description of new products for sale on a weekly basis.
I’m not sure where to start with this?
Can this be done in the theme already? Perhaps there is a way to create a photo blog page or do I need to download a plugin.
I’m not a coder so any help would be appreciated. Thanks