You can do pension splitting on any version of TurboTax 2017, but you would need at least Standard to use the pension splitting optimizer. The optimizer also will only work if you prepared your return together with your spouse.
You can
make changes after you have filed your tax return through the CRA or through
ReFILE: https://turbotax.community.intuit.ca/replies/2647992 There is a small fee for ReFILE.