1. Ways to use

The simplest one (and the only one I can think of) is adding the script to your profile. If you need help, look at the section below.

1.1 Adding a profile (if you don't have one) and adding the script

You can use this link to learn more about profiles and how to make one: Creating a profile. Or paste this script in your terminal:

if (!(Test-Path -Path $PROFILE)) {
  New-Item -ItemType File -Path $PROFILE -Force
}

After that, you can use something like Notepad or VSCode to open the profile file and paste the code from rmrf.ps1 into $PROFILE.