Your product description is visible to everyone who visits your product page, so it's important that this page is thorough!
There are 2 kinds of descriptions for your product. One is editable by vendors, the other is called the short description and appears in the Overview section on your product page. This is only editable by TrustRadius employees - please reach out to support@trustradius.com for assistance. To edit the long description:
From the product listing tab, select Description and follow the guidelines.
Next, be sure to add your product's features.