how to make this type of pictures?

some pictures have box like line structure on the things in the picture which if we take the cursor on shows some sentences on the box.how tp make that type of picture.here is a link to a instructable which contain many of such type of pictures:https://www.instructables.com/id/5-Minute-DIY-Motor/.please takt a look and tell me how to make.

Kiteman3 years ago
They are called "image notes".

When you are adding images to an instructable, you can click on the image, and a box will be inserted by the editing functions, to which you can then add text.
iceng3 years ago
Mine always appear in the top left corner and
I have to drag them to where i want them to outline what I wish to call attention to.