in building tree I made a wrong entry...how to I delete or edit mistake and enter correction/

raykp

editing tree entry?

Julia Szent-Györgyi

Here's a not-too-old blog article on correcting mistakes in Family Tree: https://www.familysearch.org/en/blog/correct-mistakes-family-tree

There's also a Help Center article on editing vital information: https://www.familysearch.org/en/help/helpcenter/article/how-do-i-change-vital-information-in-family-tree

And one on correcting parent-child relationships: https://www.familysearch.org/en/help/helpcenter/article/how-do-i-correct-parent-child-relationships-in-family-tree

And another one, on correcting a spouse: https://www.familysearch.org/en/help/helpcenter/article/a-person-in-family-tree-has-the-wrong-spouse