Reporting part-time earnings while on benefits - 14 months and counting

I work some days through a staffing agency while still certifying. 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?

Thanks for writing this out. I went through something close to it 14 months ago, and it got easier once I kept a simple log of every call and form.