You do not enter your children's income on your tax return. They have to file their own tax returns to report their income. When they do that, make sure they check the box that says someone can claim them as a dependent.
A TurboTax Online account can be used for only one person (or one married couple filing jointly). If your adult children want to use TurboTax Online to file their tax returns, they cannot use your account. They have to each create an account of their own. If you are going to use TurboTax Online to prepare your children's tax returns for them, you cannot use the same account that you used for your own tax return. You have to create a separate account for each child.
