Asking questions isn't dumb, Julie.
The easiest way to find a rose is to look for it alphabetically instead of using the search function. Go to the main rose page and click on "Browse the full list of roses." This will take you to a page where you'll see letters at the top. Click on "S" and look for 'Si' alphabetically.
I'm excited that you'll be adding a photo. We don't have any in that entry yet.
The easiest way to add something to your own plant list is to go to the entry, scroll down to the blue block saying "Add this plant to your list," and click on that:
Rose (Rosa 'Si')
