If you are not using a computer and have only one device on hand, then it isn't as easy, but it can be done.
Write down on a piece of paper, the list of names of irises that you want to display into your post. You can also put them in as an edit, so you don't need to make a new post.
Then look up each one in the "Plant Database" or Iris Database. When you find your picture, enlarge it, then copy the numbers that are in between the brackets. When you finish, go back to your post and go to the bottom on the page and click on "edit".
Then erase your names, and then if you want, you can type them singly, though it is not necessary as the names will appear in the space above the picture.
Use a bracket [ and then put the number in there, and then finish with the other bracket. Then preview each time, just to be sure they are correct, then post!