That’s up to you. Hess makes a contribution at the start of each year to your HSA. The amount Hess contributes depends on whether you have individual coverage or coverage that includes dependents. Then, each year, you can contribute up to a maximum total amount set by the IRS. See the Health Savings Account (HSA) section for IRS annual limits.
If you are an active employee, you fund your HSA with before-tax dollars. If you are a retiree, you fund your HSA with your own after-tax dollars and take a tax deduction when you file your federal income tax return.