Yes, you can.
Your IRA contributions may or may not be deductible if you're in an employer-sponsored plan (the 401k). The deductibility will depend on your filing status, modified AGI, and (if married) whether your spouse is covered under an employer plan.
Here's a link to IRS Publication 590-A, which discusses these limitations (see the tables on p.13): https://www.irs.gov/pub/irs-pdf/p590a.pdf.
You'll enter any IRA contributions in TurboTax by selecting Federal Taxes > Deductions & Credits > Retirement and Investments > Traditional & Roth IRA Contributions and following the prompts.
However, with net earnings in excess of $18,000 ($24,000 if age 50 or older in 2016), there will be *some* net earnings left to contribute to a traditional IRA, perhaps enough to make the maximum traditional IRA contribution. Since your solo 401(k) contributions make you covered by a workplace retirement plan, whether or not that traditional IRA contribution will be deductible will be determined by your filing status and modified AGI.