On what computer operating system is your Premiere Elements 13 running?
What are the properties of your graphics? Are these .png files? Provided they are supported by Premiere Elements 13, you can import them from their hard drive save location
into Premiere Elements using Premiere Elements Add Media/Files and Folders/Project Assets from where you drag the file to its place in the Timeline.
Or, is your intent rather to have them permanently in Premiere Elements 13 under the Graphics Tab in the Expert workspace?
Is your intent to know how to add graphics to a project or are you asking about how Premiere Elements 13 works in general?