Do you just need to change that one thing?
You can edit anything that originally transferred into your 2018 return, if necessary, if it needs updating/correcting since you changed something in your 2017 return.
Are you asking how to get back to the investment interest expense topic in order to edit carryover figures that transferred in from 2017? If so, once you are back in that topic, you will see an option to edit any 2017 investment interest expense carryover figures. We can tell you how to get there. Are you using Online TurboTax or the desktop software (CD/download)?
