The scripture tool adds scripture from the bible automatically. you do not even need a short code to get it going. Just add your scripture like this Psalm 137:1 and the scripture will be added

The scripture is taken from the ESV in accordance with their conditions for use, and their full consent. It even caches the scripture for you, thus ensuring that you need not link to the ESV website every time to get the scripture and slowing your website down.

As stated, everything to get this script working is already set up, and you do not have to add anything.