how to udpate iTerm theme

First dowload iterm2

brew install --cask iterm2

https://iterm2.com/index.html

Oh My Zsh

install with curl

sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"

Powerlevel9k / Powerlevel10k

https://gist.github.com/kevin-smets/8568070

and then edit ~/.zshrc and set ZSH_THEME="powerlevel10k/powerlevel10k". To open the the ~/.zshrc write nano ~/.zshrc it should open it and edit and save the file and open a new tabe and it will start the wizard

and can use one of these colors there like I use dracula

https://iterm2colorschemes.com/

If it didn't work then follow this link https://gist.github.com/kevin-smets/8568070

Good luck!