Depending on your system, you can folow the installation from OH-MY-POSH
On Windows, you can run add the line bellow to customize using this theme:
notepad $PROFILE
For Windows Powershell :
oh-my-posh init pwsh --config 'https://raw.githubusercontent.com/Nickael/ohmyposh.theme/master/.nr.nordic.omp.json' | Invoke-Expression
For Bash :
eval "$(oh-my-posh init bash --config 'https://raw.githubusercontent.com/Nickael/ohmyposh.theme/master/.nr.nordic.omp.json')"
For Zsh :
eval "$(oh-my-posh init zsh --config 'https://raw.githubusercontent.com/Nickael/ohmyposh.theme/master/.nr.nordic.omp.json')"