How to read 1/4 audio jack data sheet?
First of all, you have the wrong jack.  The RN112BPC is a stereo jack; the one in the schematic is a mono jack with a switched lead, which is the RN112APC on the right:



I agree, the documentation for this is terrible.  On another site, I was able to find a little picture, and another, a labeled board layout:



Note the board layout is upside down, as it shows the pins as if you were looking down at the board.  So you have to flip it in order to locate the pins on the bottom of the jack.

A mono jack, used in a guitar, has just a Sleeve and Tip connection (if it was stereo, the Ring connection would be the other channel).  The Tip Shunt connection is the switched lead, not used in your case.