I need help changing parents

After getting an inconsistency that someone was too young to have 2 children listed as theirs, I have discovered that the 2 children in question did have a different mother. I added her as a parent, but am unable to split the original parents to show that one is adoptive. It's either list the originals as the biological parents or the real mother and "unknown" as biological parents. Can anyone help with this? Here is the link to one child. I need to change the biological parents to Joshua and Eunice and the adoptive as Elvira.

https://www.geni.com/people/Elmer-Stowell/6000000056723931838?from_flash=1&fsession_id=1598642841257&through=6000000056723931838