Deebie, You can add the plant by going to the database page and clicking on Add a new plant to the database, then enter the following information.
Primary common name: Vinca
Accepted Botanical Name: Vinca minor
Cultivar Name: Double Bowles (do not add quote marks)
Click on Proceed to Step 2
It will go into a queue for the database moderators and you will get a system message letting you know it's been added.