@laurambartholome assuming that you are US citizen/Resident(Green Card), while in your return click the personal info tab and you should see all the info about each of you -- you your dependents etc. You should be able to change the SSN of your daughter here. If you using a desktop version then you can also go to forms mode ( top right hand "forms" icon or use the view button and from the dropdown select forms mode); then from the list of forms select the XXXXX ( name of your daughter) personal worksheet -- you can make changes herein.
Why do you have to change the SSN -- what did you use in 2018? Also , since your husband is a non-US person, under some circumstances you could be "considered unmarried " and therefore if you are maintaining a household for a minor child, you could file as Head-of-Household ( larger standard deduction)
If you husband does not have any intention of having his world income taxed by the USA, then perhaps there is no need for him to get an ITIN ( it is only used for taxfiling -- there is no other benefit ).
Is there more I can do for you?