Welcome to the "Community.FamilySearch" Forum.
I am just another 'lowly' User/Patron ...
Just in passing ...
Depending on the situation/circumstance ...
Here are a couple of "Knowledge Articles', in 'FamilySearch':
A person in Family Tree has the wrong spouse
I hope, that this may help/assist, somewhat.
What sort of entry is it that you want to delete? Has Brett covered it in his reply or do you need further information?
The Tree that you have added names to is not a personal tree, but a one-off global tree, where anyone can add their information, building relationships and strengthening ties. Enjoy linking into the tree and discovering more relatives and families.