How to Squash 3 commits into 1?

I'm fairly new to git, so I've been trying to figure out how to squash 3 commits into 1 so my PR can get merged. I've read a lot of docs and guides and sort of found out how to squash commits but one of my commits aren't showing up. I tried attaching a photo of my commits and a photo of my terminal when I type in: "git rebase -i HEAD~5", but unfortunately I'm a new user so I can't? But anyway, I would greatly appreciate some help.