Before proceeding, make sure ohmyzsh is installed and working properly!
Install antigen
macOS homebrew
brew install antigen
Configure antigen
More precisely, configure .zshrc
After installing antigen, find its path, then modify .zshrc to add the following content
# Load antigen
source /opt/homebrew/share/antigen/antigen.zsh # Path for antigen installed via brew
# Load oh-my-zsh
antigen use oh-my-zsh
# Install plugins
antigen bundle command-not-found
antigen bundle zsh-users/zsh-syntax-highlighting
antigen bundle zsh-users/zsh-autosuggestions
antigen bundle zsh-users/zsh-completions
# Install theme
antigen theme robbyrussell
# Apply the above commands
antigen apply
After saving, source the zshrc
source ~/.zshrc
Then in the terminal you will see
➜ /Users source ~/.zshrc
Seems robbyrussell/oh-my-zsh is already installed!
Seems zsh-users/zsh-syntax-highlighting is already installed!
Seems zsh-users/zsh-autosuggestions is already installed!
Seems zsh-users/zsh-completions is already installed!