To edit or add a variant to an existing product, follow these steps:

1. Go to the "Products" section in the WhiteWall app:
   

2. Find the product you want to update and click on "Edit".
   
   
   
   
   

3. From there, you can add, edit, or delete product variants as needed.
   

4. Once you're done, click on "Update" to save your changes.