I am trying to enter my T5013 but I cannot find box 134, or 248. What am I missing?

Boxes 247, 248 and 249 on the T5013 are used for Corporate (T2) and Trust (T3) tax returns only, and not for individual (T1) tax returns. 

TurboTax automatically calculates Box 134, so there's no need to enter the amount.