You want to run Plex Media Server on the ioSafe 214, correct? Not on Windows (you tagged the post with server-windows).
Which version of DSM are you running? Hopefully 6.x. There are issues with running Plex on DSM 7 beta/RC.
If you are running DSM 7 beta or release candidate, stop. DSM 7 is a different beast. Verify the installed version of DSM and report back.
Assuming you’re running DSM 6.x:
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PMS 1.13 is a very old version. I’m not sure how far the installation process ran, but if complete, uninstall it from the NAS. If they exist, delete the Plex user and the Plex shared folder. FYI, the Plex shared folder is for the exclusive use of Plex Media Center. Do not place any of your media files in that folder. Plex will not work correctly if you place your media there.
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The ioSafe 214 is the same as a Synology DS214. Download the current ARMv7 version for x14 series Synology from plex.tv/download and perform a manual installation.
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Proceed with the rest of the installation as shown in the Installation & Setup document.
The Plex Synology FAQ also has helpful information: Synology FAQ (DSM 5 & 6) - Questions, Answers, and a few How-To’s
PMS download screen at plex.tv/download