are you trying to delete yourself?
could you change the info. to be someone you want it to be?
This is what GR says:~
You have the option to delete the whole tree or an individual in your tree. You will not be able to remove yourself as the anchor to your tree, unless you follow the process for cancelling your registration.
To remove an individual from your tree you need to select the name of the person to be removed and then click on the 'Delete relation' button in the edit tools section at the bottom of the My Family Tree page.
You can only remove a name from your tree if it is at the top or the bottom or has no other branches attached to it. For example, you can remove the child of a relation. However, if you have added the wrong father, you would need to remove any children first before deleting him. You will see a message saying you cannot delete a relation if other names are attached to that person. You will need to look at your tree and either remove names from the bottom upwards or from the top down depending on where the relation is that you wish to remove.