Since you used the MAC version, you'll use the same TurboTax program that you used to prepare your original filing. See this TurboTax FAQ regarding how to amend with TurboTax:
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
Your Roth 401(k) is not a Roth IRA. Your wife's traditional IRA has no bearing on anything having to do with your In-plan Roth Rollover from the traditional account in the 401(k) to the designated Roth account in the 401(k).
