Wage reporting when hours change weekly after 14 years as a welding apprentice

I work some days through a staffing agency while still certifying. I am in St. Louis, in case local advice matters. The form asks for gross earnings, which I do not see until later. Who can I ask without risking my claim?

In my state the question was about the week I worked, not the week I was paid. Read the wording on your form carefully, or ask the claims line.