Wage reporting when hours change weekly - what worked for you?

I picked up part-time shifts as an event coordinator and I am confused about how to report them. This is my first time dealing with any of this. The form asks for gross earnings, which I do not see until later. Who can I ask without risking my claim?

The claimant handbook has worked examples for part-time pay. Mine was clearer than the phone line.

Report honestly and keep your stubs. An honest small error is much easier to fix than a missing report.