You may want to add in Specifications or Descriptions on your Integrated Storefront. In order to do so, please follow the below steps.
Enter the Item's Page in Inventory.
Press the "Settings" button in the top right corner.
Scroll to under "Storefront Settings."
See above for a visual representation of the previous steps
For Description: Press the pencil icon at the right side of the tab under "General."
For Specifications: Press the pencil icon at the right side of the tab under "Specifications."
Input the desired information and press "Submit" in the top right hand corner.