Can someone figure out how to update Mariclare Costello's page. I tried, but failed.

Mariclare Costello was a character in the television show The Waltons. She played Miss Rosemary Hunter, who married the Reverend Matthew Fordwick (played by John Ritter)and became Mrs. Rosemary Fordwick in Season 4, Episode 1 (Entitled The Sermon). Can anyone figure out how to update her page? She was an important part of the cast, and it would be nice for her to get recognized as such.