Ever come across the situation where you are logged in to a system with a shell you don't like? Ever wanted to change that default shell to something you are more comfortable with? Luckily, it's pretty quick, and definitely easy. The chsh utility was created for just this.
As the user you want to change the shell for, just run the following if say you want to change your shell from sh to bash:
$ chsh -s /usr/local/bin/bash
You will be prompted for your password, so just enter it. And that's it! The next time you log in, your FreeBSD shell will be defaulted to bash.