If this is not your personal self-employed business, you would report the income from the investment in TurboTax under Wages & Income >> Investment Income. Your actual investment is not reported on your tax return; only the income reported to you from the investment may be taxable.
The easiest way to find any section of TurboTax Online, is to open your return, go to Tax Tools in the left column, then Tools >> Topic Search. Type in your topic, click the topic in the list and then GO to go directly to the start of that section.
See also: What's the difference between investment property and personal-use property?
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