The Plex Claim Token is a menu option when you install the app on DSM 7.
Coordinated with you and your browser, it gets a ‘claim token’ from plex.tv for your account.
It then goes to plex.tv on your behalf with that claim token and installs your account credentials in your DSM 7 Plex server.
It’s pretty slick 
Complete with screenshots and instructions, here’s the How-To from the Syno FAQ
Follow this in a separate browser window and it will get it done for you.
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