export NVM_DIR="$HOME/.nvm"
. "/usr/local/opt/nvm/nvm.sh"

If you are using the Bash shell, open the ~/.bashrc file in your favorite text editor, and add the following lines at the end of the file:

export NVM_DIR="$HOME/.nvm"
. "/usr/local/opt/nvm/nvm.sh"

If you are using the Zsh shell, open the ~/.zshrc file in your favorite text editor, and add the following lines at the end of the file:

export NVM_DIR="$HOME/.nvm"
. "/usr/local/opt/nvm/nvm.sh"

After adding the lines to the appropriate file, save it and close the editor. Then, restart your terminal or run the source command to load the changes:

source ~/.bashrc

source ~/.zshrc