Assuming that you are US citizen/resident and that you are working in the USA, the easiest is to tell TurboTax that you have self-employed income. It will then ask for 1099-misc, you say you don't have one . Then it will walk you through filling a schedule-C just as if you are a sole proprietor business. Provide the Gross Income ( from your statement of income), just show no expenses ( zero everything ). This will then generate the schedule-SE and transfer the gross income and the SE taxes to form 1040. That is all.
If you need more help, feel welcome to add in comments .