You are correct, you cannot include your trading income to calculate contributions to retirement plans, since it is not considered "earned income". Since you are using the Desktop version of TurboTax, I suggest you go to the "Forms" view of the program. If you are not familiar with the forms view, see this TurboTax help article: What is Forms Mode? You can use a third party online calculator to determine your SEP contribution. Make adjustments to the worksheets that calculate the contribution and QBI Deduction, or enter correct amounts directly on the forms - if allowed (some fields can be changed, others have to be changed in the underlying schedule/worksheet.
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