Schedule 4 has been eliminated by the CRA for 2018: https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...

In TurboTax CD/Download, when you enter your investment income and expenses (through slips, etc…), they go to a worksheet called INVEST - Statement of Investment Income. If you are searching for it in Forms mode, search for INVEST. Double click on the amounts on the INVEST worksheet to open the slips where the info comes from.