How to install module/plugin on Joomla administrator

1. Make sure install module redSHOP - redMASSCART is successful.

2. User enable module, select position and select Module Assignment redSHOP - redMASSCART: Extension → Module → search redMASSCART  

3. User go on Administrator and create product have name "Product number 15" and Product number "15" 

4. User go to Front-end and view module redSHOP - redMASSCART 

5. User fill in "15" on field Product Number and click "Add to cart" button 

6. Webpage will redirect to Cart page