Access what?
The money? Contact the 401k plan administrator. Usually when a plan is terminated, they contact you and ask for your decision on what you want done with the money.
Where do you enter it in Turbotax (TT)? The plan administrator will send you a form 1099-R. In TT, enter the 1099-R at "Retirement Distributions". or type form 1099-R in the find box
