If you are an Independent Designer, and not an employee, you would normally receive a 1099-Misc for the compensation you received.
A 1099-Misc does not need to be filed by the payer if the amount paid is less than $600, however since you received the compensation you do need to report the income on your tax return.
Since the corporation is not sending you a 1099-Misc for your compensation, you will need to use your own records to report the income, as well as the expenses relating to that income.
In TurboTax Deluxe online, you can enter the income by clicking on:
Federal on the side bar
Wages & Income on the top center of the screen
Scroll down to Self-Employment which is under All income
Continue through the screens
The software will make you aware that you will need to upgrade to "Self-Employed" in order to include a Schedule C with your return.
You will be taxed on the income, but remember that you can also deduct your expenses.