What computer operating system is your Premiere Elements 13 running on? Have you updated 13 to 13.1 yet from an opened project's
Help Menu/Updates. If not, please do so.
You can create an DVD-VIDEO ISO Image or AVCHD ISO Image in Premiere Elements 13/13.1, but you cannot take the Premiere Elements .iso
to disc using the Premiere Elements Publish+Share. You need 3rd party software such as ImgBurn.
See ImgBurn "Write image file to disc".
Also be aware
Any questions or need clarification on the above, please ask.