Open the file 'StyleCLIP-Global' in a supported interactive python notebook environment, preferably Google Colab, you can also use Jupyter Notebook or Visual Studio Code with Jupyter Extension
Make a copy of the file in Google Colab before you start working just in case you mess up the file, you'll be able to start fresh by making a copy of original file once again.
Performing the task is very simple, all the steps are mentioned in the file and cell already.
If you want to work on a specified image you need to upload it in the environment/repo and provide it's location, when required, correctly or it will throw an error, you can use the default images provided or get a generated image from the model as well.
A high definition version of the ouput image will also be provided.