In your Miiduu store, you can fully control the products that are listed on your homepage.

Step 1) 
Go to Catalog->"Products"->"Product Info"->"Inventory and Variants"->Check “This Product Has Special Price” and enter the related information.

Step 2) 
Go to Design->Layout->Homepage->Drag & Drop the 'Home Specials' block to the 'Main Content' Section and remove the 'New Arrivals' block.

Now your customers can view your sale products on your store’s homepage.