"Can I open my form 8949 in Turbotax and modify the required bases? Or do I need to do something else? Please post a link to any article that explains the process."
To answer your actual question: Yes, you can do that in "forms mode" if you are using a desktop product. To get the "correct" presentation here you'd enter your adjustment in column (g) and enter a "W" in column (f). This might prevent e-filing if you are forced to "override" amounts and codes that are already there, but should not pose a problem if you're simply filling in blank fields.
If you're using an online product then the forms aren't available to you for direct entry but you can accomplish what you're trying to do using "interview mode." Go back to the sale where you want to make the wash sale adjustment and edit the sale. Click on the "I'll enter additional info on my own" blue button and on the next page enter your adjustment in the "Wash sale loss disallowed" box. That will correctly report the trade on Form 8949.
