How do I start a tree for someone I am not related to?

I would like to start a tree for someone I am not related to, and who has been dead for a hundred years. How do I do it - I don't find out where to write.

Create the person as a child of yourself and then detach the profile from you. Make sure you "follow" it so you don't lose it. If you need help, let one of us know. Also, if the person has been dead for a hundred years, are you sure that he/she is not already in the tree? I can do an Advanced Search for you if you want first.