How do I add footnotes to a story?

Put your cursor inside the story were you want to add one. Then go to Insert>Footnote and fill out the text box.

Would love to use this program but cannot get to launch

What operating system are you trying to run Personal Historian on?

I was trying to run on MacOS Catalina like RootsMagic 8. Managed to install on a Windows 10 under Parallels on the same Mac.