Hi, first of all thank you for making use of our Samsung Galaxy Forum.
The provided links will not be supported on Tab S2 SM-T713. Right now we don't have a tutorial to root Tab S2 SM-T713 Marshmallow, don't worry I will update this thread once we publish a dedicated tutorial for your model. In the meantime please try rooting using the KingRoot APK which can be found in the below link.

http://www.samsungsfour.com/downloads/downloads-for-rooting-all-samsung-galaxy-smartphones-without-pc.html

Alternatively please try the below methods also and let me know the result.


http://www.samsungsfour.com/tutorials/how-to-root-or-unroot-your-samsung-galaxy-smartphone-all-models.html
http://www.samsungsfour.com/tutorials/how-to-root-all-samsung-android-phones-using-root-genius.html
http://www.samsungsfour.com/tutorials/how-to-root-all-galaxy-smartphones-without-pc-kingoroot-apk.html

Do I do that directly from the device or do I have to use Odin?

The methods are different from each other so please follow the tutorials carefully and let me know the result.