You can import them directly to the database from the posts here by enlarging them and clicking on the blue "Associate with a plant in the database" and then typing in the name (or copy and paste the name from the post to avoid typing it twice!)
Or you can find the plant in your inventory list here and once in the entry, the add photo option is on the left side.
Give Acorns (1) | Quote | Post #1115614 (12)
Niki this was copied from Calif_Sue when I asked in the 2016 blooms thread.