How to remove lowe spray Arm

Dishwasher Repair
1

How tto remove lower spray arm?

2

This should help
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/52521bdbd0ef763c85256cbc00520548/$FILE/8178022.pdf

3

Thanks for your help.