How to perform a Force Defrost Cycle

I am pretty sure that my fridge has froze up as the internal fan sounds like it is hitting ice when it is running.

I have searched, with no luck, on how to perform forced defrost cycle.

The fridge is less than 1 year old, and I know it is under warranty, but before I call whirlpool, I’m looking to diagnose and fix the problem myself.

Thanks for any help.

Whirlpool Gold Series
WRX988SIBM