Try entering "/usr/bin/ee" to open ee. If this doesn't work, then I don't know how you managed to install FreeBSD without ee. It's a standard on FreeBSD systems. It doesn't depend on what your default editor is.
You might try entering "locate /ee". (You might first have to run " /usr/libexec/locate.updatedb &") This will return the location of any file starting with "ee" on the system.
For basic vi usage, just remember these 5 things:
1. Vi starts in a "command" mode, not in an editing mode. To enter other modes, you enter keys or key combinations. To exit back to command mode, you hit the ESC key.
2. You cannot start editing text until you have hit the "i" key (for insert).
3. You cannot get out of text editing mode until you hit the ESC key.
4. You can enter delete mode by hitting the Delete key once, and then using the Delete key as normal. Again, exit to command mode by using the Esc key.
5. From command mode, you can quit by entering ":q!". (This will exit without saving changes). To save the current file, you can enter ":w". To save the current file as a new file, use ":w filename".
This can get you in and out of vi. The rest you can learn later.