Yes basically depending on which foreign country it is, you should not be taxed twice if there is a treaty established between the US and that foreign country. So basically add your foreign income as a source of income in turbo tax and then deduct the taxes you already paid through your paychecks to the foreign country as credit so that you don’t get taxed twice. Let me know if that doesn’t make sense still, you should be able to find information on turbo tax about how to enter the extra income and the foreign credit
