Form 8826 is not supported by TurboTax. The tax data from the Form 8826 is entered in the TurboTax program using the general business credit Form 3800 Part III Line 1e. You will have to print and mail the tax return and attach the Form 8826 to the mailed return.
IRS Form 8826 - https://www.irs.gov/pub/irs-pdf/f8826.pdf
Enter 8826, disabled access credit in the Search box located in the upper right of the program screen. Click on Jump to 8826, disabled access credit
On the screen Other Business Credits, on General business credits, click the start button
