Jane, When you go to the Multi-Plant area there will be a place that says, add a multi -plant image.
After you down load a picture there will be a place that asks you something like, are you happy with this picture. If you click to go on, then at the top of the page it will tell you how to draw a box around it and will ask you to identify it. It is always helpful to have a second window open so that you can go to the data base and get the number for the plants that you are identifying.
You can write either the plant number( which when people click on that it will take them to that plant in the data base), or the name of the plant in the box that will show up at the top of the page. It sounds complicated but it's really easy once you down load your photo because there are really good instructions there. There is also a place to delete it if you are not happy with what you've got.
Hope this is a help and not to confusing.