Hello, E.!
If you are trying to disconnect Elizabeth [77098] from Thomas [Smith-76885], click her "Edit" tab and look for "Edit Family" on the right side of the page. Under Thomas, you should see a link that says "edit father." Click that link and look near the top middle for a link that says "remove" (or just scroll down to the bottom of the page, since that is where the remove link takes you). Click on the green box that says "REMOVE THOMAS AS FATHER OF ELIZABETH SMITH" and you should be all set!
If any other connections are incorrect, disconnect them before you connect Elizabeth to her correct father.
Also, have a notepad handy to keep track of your changes or of any profile IDs that you will need when connecting to the correct profiles!