For starters, if you make changes in forms mode, chances are high you will *automatically* invalidate the TurboTax 100% Accuracy Guarantee. Additionally, you will not be able to e-file. You'll be forced to print, sign and mail the return to the IRS (and to your state if applicable).
In the assets section click the "Add an Asset" button.
Select Intangibles, Other Property and continue.
Select Other asset type and continue.
Keep working it through from there and you can select your asset type and class life.
Since the asset was placed into service in a prior tax year, you'll be asked for prior years depreciation already taken. To get that amount look at the 4562 titled Amortization & Depreciation Report from the 2018 return. Add together the amounts in the prior year depr column and the current year depr column and enter that total into your 2019 return for the total of all prior years depreciation already taken in prior years.
