Step 1: Download the iterm2 from https://www.iterm2.com
Step 2: Run the terminal and install the homebrew as bellow:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
Step 3: install “wget” by homebrew as bellow:
sh -c "$(wget https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"
note: if you can’t not run the above correctly can try this step below firstly