-bash: bundle: command not found

I am working on control flow exercises. I forked everything as usual and tried a suggestion - gem install bundler - from a similar post (see below) and received a permission error. I deleted the control flow folder and re-downloaded it using the git clone link, per the instructions (git clone https://RyanMRolfes@bitbucket.org/appacademy-online/03d4aa27-ryanmrolfes-control-flow-exercises.git) but I am still having these issue. Now I am stuck and cannot move forward with this section.

Any help appreciated!

RyanRolfessMBP4:03d4aa27-ryanmrolfes-control-flow-exercises ryanrolfes$ ls
Gemfile README.md lib spec
RyanRolfessMBP4:03d4aa27-ryanmrolfes-control-flow-exercises ryanrolfes$ gem install bundler
ERROR: While executing gem … (Gem::FilePermissionError)
You don’t have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
RyanRolfessMBP4:03d4aa27-ryanmrolfes-control-flow-exercises ryanrolfes$ gem install bundler
rbenv rehash
ERROR: While executing gem … (Gem::FilePermissionError)
You don’t have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
RyanRolfessMBP4:03d4aa27-ryanmrolfes-control-flow-exercises ryanrolfes$ rbenv rehash

Try this out!