You should start by answering the questions in the "Profile" section of your tax return first, once that has been done, the software will walk you through the steps.
Depending on what type of dividends you are referring to, you would access this line by starting under the "Income" tab - then proceed to "Investment Profile", or you may have Tslips related, if that is the case, accessing your "Tslips" is also under the "Income" tab.
To see line 120 directly, in your tax return, look at the top left of your screen, where you see your amount owing (red) or refund (green), there is a down arrow - click on it and you will have the option to view your Detailed Tax Summary, click on it to open - line 120 (which is now line 12000), will be displayed there for you.
Please see below for more information if needed.
Taxable amount of dividends (eligible and other than eligible) from taxable Canadian corporations - Line 12000 of the T1.
This is the total dividend value, plus a 41% gross-up for the eligible dividends and a 25% gross-up for the dividends other than eligible dividends. A dividend tax credit is also available. It can be from T5, T4PS, T3 or T5013.
From the CRA Line 12000:
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