Go to irs.gov and download 2018 Form 1040-ES and the instructions.
You can either pay quarterly estimated taxes or increase your withholding from your wages to cover the additional taxes on non-wage income.
Since you already have significant non-wage income for 2018, if you choose to pay quarterly, the first payment is due by Tuesday.* If you increase your withholding, there is less urgency, because withholding is treated as if it is paid equally throughout the year.
I’ve just given an overview here, since this is all explained in more detail in the Form 1040-ES instructions, but come back if you have more questions after looking at them.
Sorry I can’t help with the Turbo-tax question (but I expect the answer is yes).
* If you can’t get it done by Tuesday, still do it as soon as you can, because the interest is computed daily. If you’re only late by a few days or a couple weeks, it won’t amount to much.