### Step 1: Install ###
brew install antigen
# or ,
curl -L git.io/antigen > antigen.zsh
### Step2: Activate ###
# add this line in ~/.zshrc file
source $(brew --prefix)/share/antigen/antigen.zsh
# or, source /path-to-antigen/antigen.zsh
### Step 3: Restart shell ###
exit # and open a new terminal again