It depends on what your employer gave you. If you were given a T2200, then you would select that, and fill out a T777 like in previous years. If you were given a T2200S, then you would select that, and get the option to use either the Detailed Method or the Flat Rate ($2/per day).
This FAQ tells you how to claim Employment Expenses in TurboTax Online: https://turbotax.community.intuit.ca/community/claims-deductions-donations/help/where-do-i-claim-my-employment-expenses-in-the-online-edition-of-turbotax/00/873421
This FAQ tells you how to claim Employment Expenses in TurboTax CD/Download: https://turbotax.community.intuit.ca/community/claims-deductions-donations/help/where-do-i-claim-my-employment-expenses-in-the-windows-edition-of-turbotax/00/873799