Add elements from My Library is simple. All you have to do is go to the Insert menu and click on My Library. Then, drag and drop the element into the presentation and place it where you want. Another way is to click on the element saved on My Library, and it will automatically appear in the presentation.
An important fact to keep in mind is that when you import an element from your Library, it will import the structure and content, but the style will follow the presentation style.
Remember
It is good to know that the element you save is a copy and remains in your Prezi Account Library; it won’t disappear if you delete the presentation you previously copied from.