Delete a name

Georgianna StevensDiStefano

How can I delete a name that I entered in wrong place on my tree

Áine Ní Donnghaile

If you are the only person who has worked on that PID, the process is simple:

https://www.familysearch.org/help/helpcenter/article/how-do-i-delete-a-person-from-family-tree

Julia Szent-Györgyi

... but if it's an actual person that you do want to enter, just in a different place (i.e., with different relationships), you could edit the relationships instead.