The widgets can be set in Appearance → Widgets page. In this page you will be given a list of registered sidebars and you can drag&drop preset widgets into them. Here you can view a full guide on how to use Wordpress widgets.
In order to register new sidebars you can navigate to "Appearance → Portus Management → Sidebar Settings"
Here will be a list of widgets that are custom for Portus theme:
Displays "About us" information into a widget.
|Portus Custom 300x250/300x600/160x600 Ads||
A widget that allows the display and configuration of of a single 300x250 Banner.
Displays latest Flickr images from a specific user
|Portus Latest News||
Displays latest news from blog.
|Portus Popular News||
Displays all the popular posts from blog.
Displays all the review posts from blog. (must have the review meta fields filled in while editing the post).