To link "DemoBox" onto your website, you will first need to make sure your "DemoBox" is set up, if it's not, please see the following article: How do I set up a DemoBox for my label?
Once your "DemoBox" is set up follow these steps:
1. Go to "Demos -> DemoBox Manager"
2. Under the section "Link to your DemoBox" you can copy the "Link" Html snippet and place this on your website.
Alternatively, if you would like to embed the DemoBox submission form to your website, please see the following article: How do I embed DemoBox on my website?