cb, I'm not good at explaining stuff but here goes:
Find the plant in the database. Here it is for :
Cubanola (Cubanola domingensis)
Scroll down a little way and look on the left side of the page where you will see a box that says:
Adding Actions and the first choice will be:
Upload a photo
Click on "Upload a photo" and then you will see a green space that says
"Upload an Image"
Select the photo from your computer to open it and then the green area will say Uploading which will take a few seconds. Once the small photo shows up on the screen you will see a box where you check off whether it's a picture of a bloom, leaves, stem, close up of buds, etc. and then at the very bottom click on the green area that says "Submit a photo"
Your image will go into a queue for the database moderators to add it and you will get a system message telling you it's done.