You can enter follow the directions below to return to the SSA-1099 screen and delete that 1099-SA form or you can "delete that form" by following the instructions at the bottom of this answer:
In TurboTax, open your return and search for SSA-1099 (upper- or lower-case, with or without the dash).
- Select the Jump to SSA-1099 link in the search results.
- Select the trashcan/delete button beside the SSA-1099
- If you do not see your Canadian Pension Income there, select continue until you come to that start and select that no, you did not receive any other income