NX501ER wont let me change time?

The NX501ER wont let me change the time, both Clock and AM/PM fields are grey, others are yellow which are editable but grey wont let me change anything. Any idea how I can change time on NX501ER

Here's the manual:

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Yeah that was the first thing I looked at but nothing about clock won’t let me edit it please see the video below I recorded