On what computer operating system is your Premiere Elements 13 running?
There is one arrow under Graphics Tab/Miscellaneous/Sign 03.
You can create an arrow in the program's Titler Shape section with its Line Tool. Crude but effective.
Do you have Photoshop Elements or Photoshop? If so you can create an arrow in that program and save it as png, then import the png file into Premiere Elements project with Premiere Elements' Add Media/Files and Folders.
If you want our png to appear under the Premiere Elements 13/13.1 Expert workspace Graphics Tab every time you open a new project, please consider the details in the following
Have you updated 13 to 13.1 yet? If not please do that using an opened project Help Menu/Updates.
Please let us know if any of the above worked for you.