- Open a Google sheet where you wish to use the fucntions
- Go to Tools › Script editor
- Copy the content of script and paste it in the script editor (replace any existing content).
- Save the script with File › Save, name it as you want it (hint: let it be clear so you can replace it later on), then close the script editor
- Back to your Google sheet, refresh the page and you can now start using the function.
Now the functions are available for use! Try it out!