Here you go Cinta.
http://garden.org/plants/searc...
Just go to this link and click on it.
Go towards the bottom of the page and click on 'Upload Photo'
Then click on the green 'Upload Image' button.
Let me know if you need any further help.
Once you do it you will realize how easy it is.
Oh, I see what you are talking about. You don't need to add a new entry to the database, there is already an entry for Cherry Tart.
So just follow the above instruction to add your great photo to that entry. That way you will earn the acorn for adding the photo.
There will be another raffle this month, you need all the acorns you can earn. There are some really awesome items to spend your acorns on.