Once Sellacious is installed and activated, You need to create a menu item so that products can be displayed on the frontend. This is a fairly simple task. You can watch this video for more info:
Go to the Sellacious panel of your website.
Click on Menu and select All Menu Items from the dropped down menu.
Now, click on New button to create a new menu item.
Enter the name of the menu e.g. Shop, select Products from Sellacious dropped down list as the menu item type.
You can select a particular category, items of which will be displayed after clicking on the Shop menu.
Assign a menu to the menu item and click on Save to save the menu item.